Engine Controls - Self-Diagnostics - Altima: Diagnosis Nissan Altima L31

ON-BOARD DIAGNOSTICS

ECM detects malfunctions related to engine sensors or actuators. OBD-II monitors emission related components and can store Diagnostic Trouble Codes (DTCs), 1st trip DTCs, freeze-frame data, 1st trip freeze-frame data and System Readiness Test (SRT) information. Using a scan tool, this data and DTC information can be retrieved to assist in diagnosing problems. The Malfunction Indicator Light (MIL) can be used for code retrieval and fuel feedback monitoring.

When a malfunction is detected for the first time, the 1st trip DTC and 1st trip freeze frame data are stored in Engine Control Module (ECM) memory. However, in most instances, MIL will not be illuminated. If the same malfunction is detected on the next trip (under similar conditions), MIL will be illuminated and a DTC is stored (2nd trip detection logic). If a misfire or fuel system malfunction should occur during 1st trip, MIL may be illuminated or flash. DTC and freeze-frame information will be stored to aid in diagnostics by specifying operating conditions when DTC was set.

TESTING PROCEDURE

To ensure correct diagnosis and repair, testing should be done in the following order

1. Get information about conditions present when malfunction occurred. Retrieve and record DTCs and freeze-frame data. See RETRIEVING DIAGNOSTIC TROUBLE CODES. If MIL is on, and DTCs are not accessible, check for ECM fail-safe mode. See FAIL-SAFE MODES. If symptoms exist, but DTCs or freeze-frame data do not exist, go to next step. If symptoms do not exist, but DTCs or freeze-frame data exist, go to step 5 .
2. Attempt to duplicate conditions present when malfunction occurred. If malfunction is detected, perform basic inspection. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article. If using CONSULT-II, go to next step. If using generic scan tool, go to step 4 .
3. Check inputs and outputs in DATA MONITOR (SPEC) mode with CONSULT-II. See DATA MONITOR (SPEC) MODE under CONSULT-II under SCAN TOOL USAGE. Compare readings with specifications listed in PIN VOLTAGE/PID VALUE CHARTS article. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Go to «TROUBLE SHOOTING - NO CODES»(ref-135811) article for diagnosis by symptom. If malfunction cannot be verified, problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.
5. Clear DTCs and freeze-frame data. See CLEARING DIAGNOSTIC TROUBLE CODES. Attempt to reset DTC by performing DTC CONFIRMATION TEST in appropriate diagnostic test. If multiple DTCs are present, diagnose in order of priority. See «MULTIPLE DTC PRIORITY IDENTIFICATION»(ref-135505-S39452687152002061000000) table. If DTC does not reset, problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article. If DTC resets, go to next step.
6. Perform appropriate diagnostic procedure under DIAGNOSTIC TESTS. After repairs are made, perform appropriate DTC CONFIRMATION TEST to verify repair. Clear DTCs. If SRT codes are not set, drive vehicle in specified driving pattern to set all SRT codes. See SYSTEM READINESS TEST.

MULTIPLE DTC PRIORITY IDENTIFICATION (1)

Using Scan Tool

See SCAN TOOL USAGE.

Diagnostic Test Mode II (Self-Diagnostic Results)

In this mode, DTCs and 1st trip DTCs are indicated by the number of MIL flashes. DTCs and 1st trip DTCs are displayed at the same time. If MIL does not illuminate when engine is running in diagnostic test mode I, all displayed items are 1st trip DTCs. If MIL is illuminated when engine is running in diagnostic test mode I, and only one DTC is indicated, it is a DTC. If 2 or more DTCs are indicated, they may be either DTCs or 1st trip DTCs.

A particular DTC can be identified by the number of 4-digit numeral flashes. The zero is indicated by 10 flashes. The length of time the 1000th-digit numeral flashes on and off is 1.2 seconds consisting of an ON (0.6-second)-OFF (0.6-second) cycle. The 100th-digit numeral and lower digit numerals consist of a 0.3-second ON and 0.3-second OFF cycle. A change from one digit numeral to another occurs at an interval of 1.0-second OFF. In other words, the later numeral appears on the display 1.3 seconds after the former numeral has disappeared. A change from one trouble code to another occurs at an interval of 1.8-second OFF. In this way, all the detected malfunctions are classified by their DTC numbers. (Scheme 4)

Scheme 4

Diagnostic Test Mode II (Front HO2S Monitor)

In this mode, MIL displays fuel mixture condition (lean or rich), as monitored by front HO2S. MIL is on when mixture is lean and off when mixture is rich. Therefore, a flashing MIL indicates closed loop fuel control and a MIL that remains on or off indicates open loop.

To check front HO2S function, start engine in diagnostic test mode II. See ENTERING DIAGNOSTIC TEST MODE II (FRONT HO2S MONITORING). Warm engine to normal operating temperature. Run engine at 2000 RPM for 2 minutes. MIL should come on more than 5 times within 10 seconds with engine running at 2000 RPM.

Entering Diagnostic Test Mode II (Self-Diagnostic Results Mode)

Note. Switching diagnostic test modes is impossible if accelerator pedal position sensor circuit has a malfunction. ECM always returns to diagnostic test mode I after ignition is turned off.

1. Ensure accelerator pedal is fully released. Turn ignition on and wait 3 seconds.
2. Repeat the following 5 times within 5 seconds. Fully depress accelerator pedal. Fully release accelerator pedal.
3. Wait 7 seconds. Fully depress accelerator pedal, and hold for about 10 seconds until MIL starts flashing.
4. Fully release accelerator pedal. ECM is now in diagnostic test mode II.

Entering Diagnostic Test Mode II (Front HO2S Monitoring)

1. Enter self-diagnostic results mode. See ENTERING DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS MODE).
2. Start engine. ECM has now entered front HO2S monitoring.
3. To switch from bank 1 to bank 2 or from bank 2 to bank 1, fully depress and release accelerator pedal quickly.
4. Ensure monitoring sensor has changed by flashing MIL as shown in illustration. (Scheme 5)

Scheme 5

CLEARING DIAGNOSTIC TROUBLE CODES

Note. If battery is disconnected for a prolonged period of time, all diagnostic information is cleared.

Using Generic Scan Tool

If ignition is on, turn ignition off and wait at least 10 seconds. Turn ignition on. Select MODE 4 or follow scan tool manufacturer's instructions.

Checking SRT Code Status (Using Generic Scan Tool)

Select MODE 1 with scan tool, and observe SRT STATUS. An INCMP display for any SRT system indicates the self-diagnosis for that circuit is incomplete. SRT systems that have completed self-diagnosis will be indicated by CMPLT, indicating SRT is set. If any category is incomplete, go to SETTING SRT CODES.

Setting SRT Codes (Using Generic Scan Tool)

To set all SRT codes as complete, drive vehicle according to procedure shown in illustration. (Scheme 6) Perform driving procedure one or more times. If driving procedure is interrupted, repeat procedure. On A/T models, operate vehicle with shift lever in "D" position and overdrive turned on. On M/T models, operate vehicle normally, shifting at normal speeds.

Scheme 6

Entering Diagnostic Test Modes

Turn ignition off. Connect scan tool to DLC. (Scheme 7) Turn ignition on. Press START on scan tool. Press ENGINE. Select one of the following diagnostic test modes

1. WORK SUPPORT This mode enables a technician to adjust some devices faster and more accurately by following indications on CONSULT-II unit. See «WORK SUPPORT MODE»(ref-135505-S06802587932002101400000) .
2. SELF-DIAGNOSTIC RESULTS Self-diagnostic results such as 1st trip DTC, DTCs, 1st trip freeze frame data or freeze frame data can be read and erased quickly. See «SELF-DIAGNOSTIC RESULTS MODE»(ref-135505-S21067741582002101400000) .
3. DATA MONITOR Input/output data in ECM can be read. See «DATA MONITOR MODE»(ref-135505-S16694778932002101400000) .
4. DATA MONITOR (SPEC) Input/output specification of basic fuel schedule, AFM, A/F feedback control value and other data monitor items can be read. See «DATA MONITOR (SPEC) MODE»(ref-135505-S21637219892002101400000) .
5. ACTIVE TEST Diagnostic test mode in which CONSULT-II drives some actuators apart from ECMs and also shifts some parameters in a specified range. See «ACTIVE TEST MODE»(ref-135505-S36274540622002101400000) .
6. DTC & SRT CONFIRMATION The status of system monitoring tests and self-diagnosis status/result can be confirmed.
7. ECM PART NUMBER ECM part number can be read.

Scheme 7

Active Test Mode

For ACTIVE TEST mode descriptions (Scheme 8)

Scheme 8

GENERIC SCAN TOOL

An OBD-II scan tool complying with SAE J1978 has the following functions. For further information, see the appropriate operation manual supplied by scan tool manufacturer.

Mode 1: Readiness Test

This mode accesses current emission related data input and output values. In this mode, system status information is also monitored.

Mode 3: Diagnostic Trouble Codes (DTCs)

This mode gains access to emission-related powertrain DTCs stored by ECM. For DTC definitions, see DIAGNOSTIC TROUBLE CODE DEFINITIONS .

Mode 8: EVAP System Testing

This mode can close EVAP system with ignition on (engine off). The following components can be opened or closed

1. EVAP canister vent control can be opened.
2. Vacuum cut valve by-pass valve can be closed.

During the following conditions, mode 8 cannot function

1. Low ambient temperature or low fuel temperature.
2. Low battery voltage.
3. Engine running or ignition switch in the OFF position.
4. Too much pressure applied to EVAP system.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC Confirmation Test

Turn ignition on. Select DATA MONITOR mode with scan tool. Maintain the following conditions for at least 20 consecutive seconds

1. ENG SPEED: 1700-3175 RPM (steady).
2. COOLANT TEMPS: 158-221°F (70-105°C).
3. Transmission: 1st or 2nd gear.
4. Driving location: drive vehicle uphill to increase engine load.

If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

Diagnostic Procedure (4-Cylinder)

1. Check CKP sensor. See «DTC P0335: CRANKSHAFT POSITION SENSOR (POS)»(ref-135505-S09840746452002092000000) . If CKP sensor is okay, go to next step. If CKP sensor is not okay, replace CKP sensor.
2. Check CMP sensor. See «DTC P0340 OR DTC P0345: CAMSHAFT POSITION SENSOR (PHASE)»(ref-135505-S10709165342002022200000) . If CMP sensor is okay, go to next step. If CMP sensor is not okay, replace CMP sensor.
3. Visually check for accumulation of debris on signal pick-up portion of intake camshaft. If problem is found, remove debris, and clean signal pick-up portion of camshaft. If problem is not found, go to next step.
4. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Diagnostic Procedure (V6)

1. Turn ignition off. Disconnect appropriate IVT control solenoid valve harness connector. (Scheme 9) Turn ignition on. Measure voltage between ground and IVT control solenoid valve harness connector terminal No. 2 (Red/Yellow wire on bank No. 1; Red wire on bank No. 2). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 44 (10-amp) located in Intelligent Power Distribution Module (IPDM). see scheme 10and see scheme 11. Check for poor connection at IPDM connector E124 terminal No. 19 (Red/Yellow wire). see scheme 12 Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 8A (Red/Yellow wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 5 (Red wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 15 Check for open or short between IVT control solenoid valve and fuse. On bank No. 1 only, check for poor connection at Green, 8-pin connector F44 terminal No. 4 (Red/Yellow wire). (Scheme 11) Connector F44 is located in right rear of engine compartment. see scheme 15 Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 On bank No. 1, check continuity between IVT control solenoid valve harness connector terminal No. 1 (Red wire) and ECM harness connector terminal No. 9 (Red/Blue wire). (Scheme 12) For bank No. 2, check continuity of Yellow wire between IVT control solenoid valve harness connector terminal No. 1 and ECM harness connector terminal No. 8. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for open or short between ECM and IVT control solenoid valve. On bank No. 1 only, check for poor connection at Green, 8-pin connector F44 terminal No. 7 (Red/Blue wire). (Scheme 11) Connector F44 is located in right rear of engine compartment. see scheme 15 Repair as necessary.
5. Measure resistance between IVT control solenoid valve terminals. Resistance should be 7.0-7.5 ohms at 68°F (20°C). Also, check continuity between ground and each IVT control solenoid valve terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace IVT control solenoid valve.
6. Check CKP sensor. See «DTC P0335: CRANKSHAFT POSITION SENSOR (POS)»(ref-135505-S09840746452002092000000). If CKP sensor is okay, go to next step. If CKP sensor is not okay, replace CKP sensor.
7. Check CMP sensor. See «DTC P0340 OR DTC P0345: CAMSHAFT POSITION SENSOR (PHASE)»(ref-135505-S10709165342002022200000). If CMP sensor is okay, go to next step. If CMP sensor is not okay, replace CMP sensor.
8. Visually check for accumulation of debris on signal pick-up portion of appropriate intake camshaft. If problem is found, remove debris, and clean signal pick-up portion of camshaft. If problem is not found, go to next step.
9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Possible Causes - DTC P0031 Or DTC P0051

Malfunction is detected when an excessively low voltage is sent to ECM through HO2S1 heater. Possible causes are

1. HO2S1 heater circuit open or shorted.
2. Defective HO2S1.

Possible Causes - DTC P0032 Or DTC P0052

Malfunction is detected when an excessively high voltage is sent to ECM through HO2S1 heater. Possible causes are

1. HO2S1 heater circuit shorted.
2. Defective HO2S1.

Note. Before proceeding, ensure battery voltage is 10.5-16.0 volts at idle.

DTC Confirmation Test (Using CONSULT-II)

Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine and let it idle for at least 6 seconds. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

DTC Confirmation Test (Using Generic Scan Tool)

Start engine and let it idle for at least 6 seconds. Turn ignition off and wait at least 10 seconds. Start engine and let it idle for at least 6 seconds. Select MODE 3 with scan tool. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect HO2S1 harness connector. (Scheme 13) Turn ignition on. Measure voltage between ground and HO2S1 harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 15 (15-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector M4 terminal 9P (Red/Yellow wire). see scheme 9 Check for poor connection at White, 6-pin harness connector F58 terminal No. 6 (Red/Yellow wire). (Scheme 14) Connector F58 is located near ECM. see scheme 15 Check for open or short between HO2S1 and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Orange/Black wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 2. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Measure resistance between HO2S1 terminals No. 2 and 3. (Scheme 15) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S1 terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S1 terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S1 tests as specified, go to next step. If HO2S1 does not test as specified, replace HO2S1.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 13

Scheme 14

Scheme 15

1. Turn ignition off. Disconnect appropriate HO2S1 harness connector. (Scheme 16) Turn ignition on. Measure voltage between ground and appropriate HO2S1 harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 15 (15-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector M4 terminal 9P (Red/Yellow wire). see scheme 9 Check for poor connection at White, 6-pin harness connector F58 terminal No. 6 (Red/Yellow wire). (Scheme 14) Connector F58 is located near ECM. see scheme 15 Check for open or short between appropriate HO2S1 and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of Orange wire between HO2S1 harness connector terminal No. 3 and ECM harness connector terminal No. 39. (Scheme 12) On bank 2, check continuity of Red/Blue wire between HO2S1 harness connector terminal No. 3 and ECM harness connector terminal No. 40. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Measure resistance between appropriate HO2S1 outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between center terminal and each outer terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S1.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 16

Possible Causes - DTC P0037 Or DTC P0057

Malfunction is detected when an excessively low voltage is sent to ECM through HO2S2 heater. Possible causes are

1. HO2S2 heater circuit open or shorted.
2. Defective HO2S2.

Possible Causes - DTC P0038 Or DTC P0058

Malfunction is detected when an excessively high voltage is sent to ECM through HO2S2 heater. Possible causes are

1. HO2S2 heater circuit shorted.
2. Defective HO2S2.

Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine and drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle and let engine idle for at least 6 seconds. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

Start engine and drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle and let engine idle for at least 6 seconds. Turn ignition off and wait at least 10 seconds. Start engine and drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle and let engine idle for at least 6 seconds. Select MODE 3 with scan tool. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect HO2S2 harness connector. (Scheme 13) Turn ignition on. Measure voltage between ground and HO2S2 harness connector terminal No. 3 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 15 (15-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector M4 terminal 9P (Red/Yellow wire). see scheme 9 Check for poor connection at White, 6-pin harness connector F58 terminal No. 6 (Red/Yellow wire). (Scheme 14) Connector F58 is located near ECM. see scheme 15 Check for open or short between HO2S2 and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Pink/Black wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 4. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Measure resistance between HO2S2 terminals No. 2 and 3. (Scheme 15) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S1 terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S1 terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S1 tests as specified, go to next step. If HO2S1 does not test as specified, replace HO2S1.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Disconnect appropriate HO2S2 harness connector. (Scheme 17) Turn ignition on. Measure voltage between ground and appropriate HO2S2 harness connector terminal No. 4 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 15 (15-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector M4 terminal 9P (Red/Yellow wire). see scheme 9 Check for poor connection at White, 6-pin harness connector F58 terminal No. 6 (Red/Yellow wire). (Scheme 14) Connector F58 is located near ECM. see scheme 15 Check for open or short between appropriate HO2S2 and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of Pink/Black wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 41. (Scheme 12) On bank 2, check continuity of Red/Blue wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 47. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Measure resistance between appropriate HO2S2 terminals No. 1 and 4. (Scheme 18) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between terminal No. 2 and terminals No. 1, 3 and 4. Also, check continuity between terminal No. 3 and terminals No. 1, 2 and 4. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S2.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 17

Scheme 18

DTC Confirmation Test "A"

Note. Perform DTC Confirmation Test "A" first. If 1st trip DTC cannot be confirmed, turn ignition off and wait at least 10 seconds before performing next DTC confirmation test.

1. Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and warm to normal operating temperature. Run engine for at least 10 seconds at idle speed. NOTE: If engine stalls or will not start, turn ignition on and wait at least 10 seconds instead of running engine.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S37393030812002091300000) . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to appropriate DTC CONFIRMATION TEST "B".

DTC Confirmation Test "B" (Using CONSULT-II)

1. Turn ignition on. Start engine and warm to normal operating temperature. If engine will not start, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S37393030812002091300000) . If engine starts, go to next step.
2. Select DATA MONITOR mode with CONSULT-II. Observe MAS A/F SE B1 voltage while increasing engine speed to 4000 RPM. There should be a linear voltage increase in response to engine speed increase. If voltage is as specified, go to next step. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S37393030812002091300000) .
3. Maintain the following conditions for at least 10 consecutive seconds: ENG SPEED: more than 2000 RPM. THRTL SEN 1: more than 3 volts. THRTL SEN 2: more than 3 volts. Driving location: drive vehicle uphill to increase engine load.
4. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S37393030812002091300000) . If 1st trip DTC is not detected, system is okay at this time.

DTC Confirmation Test "B" (Using Generic Scan Tool)

Note. Use the following test to check overall function of MAF sensor circuit. During this test, 1st trip DTC may not be confirmed.

Start engine and warm to normal operating temperature. Using scan tool, select MODE 1, and observe MAF sensor signal. Increase engine speed to 4000 RPM. There should be a linear increase in MAF signal in response to engine speed increase. If operation is as specified, system is okay at this time. If operation is not as specified, go to DIAGNOSTIC PROCEDURE .

Diagnostic Procedure

1. If malfunction "A" was duplicated, go to next step. If malfunction "B" was duplicated, check air intake duct and vacuum hoses for disconnection. If problem is found, repair as necessary. If problem is not found, go to next step.
2. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19)or (Scheme 20). Disconnect MAF sensor harness connector. (Scheme 21)or (Scheme 22). Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminals No. 2 (Red wire) and No. 4 (Red/Green wire). (Scheme 23) About 5 volts should exist at terminal No. 2, and battery voltage should exist at terminal No. 4. If voltage is as specified, go to step 4. If voltage is not as specified, go to next step.
3. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 6B (Red/Green wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 4 (Red/Green wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14or see scheme 15. Check for open or short between MAF sensor and ECM relay. Check for open or short between MAF sensor and ECM. Repair as necessary.
4. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Black wire between MAF sensor harness connector terminal No. 3 and ECM harness connector terminal No. 80. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Check continuity of White wire between MAF sensor harness connector terminal No. 1 and ECM harness connector terminal No. 72 (on 2.5L) or No. 62 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 72 (on 2.5L) or No. 62 (on 3.5L) by backprobing, with engine at specified speeds. See appropriate MASS AIRFLOW SENSOR VOLTAGE table. If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
7. Turn ignition off. Disconnect and reconnect MAF sensor harness connector. Repeat step 6. If voltage is still not as specified, remove MAF sensor. Check hot film for damage or dust. If problem is found, clean or replace MAF sensor as necessary. If problem is not found, go to next step.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

MASS AIRFLOW SENSOR VOLTAGE (4-CYL.)

MASS AIRFLOW SENSOR VOLTAGE (V6)

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Possible Causes (DTC P0102)

Malfunction is detected when an excessively low voltage from the sensor is sent to ECM. Possible causes are

1. MAF sensor circuit open or shorted.
2. Defective MAF sensor.
3. Intake air leaks.

Possible Causes (DTC P0103)

Malfunction is detected when an excessively high voltage from the sensor is sent to ECM. Possible causes are

1. MAF sensor circuit open or shorted.
2. Defective MAF sensor.

Fail-Safe Mode

When malfunction is detected, ECM enters fail-safe mode. MIL will illuminate, and engine speed will not rise more than 2400 RPM due to fuel cut.

1. If DTC P0103 was duplicated, go to next step. If DTC P0102 was duplicated, check air intake duct and vacuum hoses for disconnection. If problem is found, repair as necessary. If problem is not found, go to next step.
2. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19)or (Scheme 20). Disconnect MAF sensor harness connector. (Scheme 21)or (Scheme 22). Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminals No. 2 (Red wire) and No. 4 (Red/Green wire). (Scheme 23) About 5 volts should exist at terminal No. 2, and battery voltage should exist at terminal No. 4. If voltage is as specified, go to step 4. If voltage is not as specified, go to next step.
3. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 6B (Red/Green wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 4 (Red/Green wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14or see scheme 15. Check for open or short between MAF sensor and ECM relay. Check for open or short between MAF sensor and ECM. Repair as necessary.
4. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Black wire between MAF sensor harness connector terminal No. 3 and ECM harness connector terminal No. 80. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Check continuity of White wire between MAF sensor harness connector terminal No. 1 and ECM harness connector terminal No. 72 (on 2.5L) or No. 62 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 72 (on 2.5L) or No. 62 (on 3.5L) by backprobing, with engine at specified speeds. See appropriate MASS AIRFLOW SENSOR VOLTAGE table under DIAGNOSTIC PROCEDURE under DTC P0101: MASS AIRFLOW SENSOR. If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
7. Turn ignition off. Disconnect and reconnect MAF sensor harness connector. Repeat step 6. If voltage is still not as specified, remove MAF sensor. Check hot film for damage or dust. If problem is found, clean or replace MAF sensor as necessary. If problem is not found, go to next step.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on. Select DATA MONITOR mode with scan tool. Wait at least 10 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3 .
2. Turn ignition on. Select SELF DIAG RESULTS mode with CONSULT-II. Press ERASE. Perform «DTC CONFIRMATION TEST»(ref-135505-S31911281742002091600000) . If 1st trip DTC is detected, replace ECM. If 1st trip DTC is not detected, system is okay at this time.
3. Turn ignition on. Select MODE 4 with scan tool. Press ERASE. Perform «DTC CONFIRMATION TEST»(ref-135505-S31911281742002091600000) . If 1st trip DTC is detected, replace ECM. If 1st trip DTC is not detected, system is okay at this time.

Turn ignition on. Select DATA MONITOR with scan tool. Wait at least 5 seconds. If first trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21)or (Scheme 22). Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminal No. 5 (Yellow/Green wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between MAF sensor and ECM.
2. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Black wire between MAF sensor harness connector terminal No. 3 and ECM harness connector terminal No. 80. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Measure resistance between MAF sensor terminals No. 3 and 5. Resistance should be within acceptable range shown in illustration. (Scheme 25) If resistance is as specified, go to next step. If resistance is not as specified, replace MAF sensor.
4. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 25

Turn ignition on. Select DATA MONITOR mode with scan tool. Wait at least 5 seconds. If first trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect ECT sensor harness connector. (Scheme 26)or (Scheme 27). Turn ignition on. Measure voltage between ground and ECT sensor harness connector terminal No. 1 (Yellow wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between ECM and ECT sensor.
2. Turn ignition off. Check continuity between engine ground and ECT sensor harness connector terminal No. 2 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 4.
3. Check the following: Check Blue, 12-pin joint connector No. 5 (connector F52). (Scheme 24) Connector F52 is located near ECM. see scheme 14or see scheme 15. Check for open or short between ECT sensor, ECM and transmission control module (on A/T models). Repair as necessary.
4. Remove ECT sensor, and place in heated water. Measure resistance between sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE»(ref-135505-S15791428152002022200000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace ECT sensor.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE

Scheme 26

Scheme 27

Turn ignition on. Select DATA MONITOR with scan tool. Ensure COOLAN TEMP/S reading is less than 50°F (10°C). Start engine and let it idle for 65 minutes. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Remove ECT sensor, and place in heated water. For location (Scheme 26)or (Scheme 27). Measure resistance between sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE»(ref-135505-S15791428152002022200000) table under DIAGNOSTIC PROCEDURE under DTC P0117 OR DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR. If resistance is as specified, go to next step. If resistance is not as specified, replace ECT sensor.
2. Allow engine to cool to less than 158°F (70°C). Start engine. Grasp lower radiator hose to check for coolant flow. If coolant is flowing, replace thermostat. If coolant is not flowing, go to next step.
3. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition on. Using scan tool, select DATA MONITOR mode, and read engine coolant temperature. If engine coolant temperature is less than 194°F (90°C), go to next step. If engine coolant temperature is not less than 194°F (90°C), turn ignition off, and allow engine to cool.
2. Start engine. Drive vehicle at a speed of more than 43 MPH for 100 consecutive seconds. This may be accomplished in shop by raising drive wheels. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S30122997622002091700000) . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21)or (Scheme 22). Measure resistance between MAF sensor terminals No. 3 and 5 (component side). (Scheme 23) Resistance should be within acceptable range shown in illustration. (Scheme 25) If resistance is as specified, go to next step. If resistance is not as specified, replace MAF sensor.
2. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Replace thermostat with an OEM replacement. Turn ignition on. Select COOLAN TEMP/S in DATA MONITOR mode with scan tool. If COOLAN TEMP/S is less than 140°F (60°C), go to next step. If COOLAN TEMP/S is not less than 140°F (60°C), allow engine to cool.
2. Drive vehicle at a speed of 50-75 MPH for 10 consecutive minutes. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S42070895212002091700000) . If 1st trip DTC is not detected, system is okay at this time.

Remove ECT sensor, and place in heated water. For location (Scheme 26)or (Scheme 27). Measure resistance between sensor terminals, with water at specified temperatures. See ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE table under DIAGNOSTIC PROCEDURE under DTC P0117 OR DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR. If resistance is as specified, test is complete. If resistance is not as specified, replace ECT sensor.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select DATA MONITOR mode with CONSULT-II.
2. Start engine and let it idle for 2 minutes. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and let it idle for 2 minutes. Turn ignition off and wait at least 10 seconds. Start engine and let it idle for 2 minutes.
2. Select MODE 3 with scan tool. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

Diagnostic Procedure (4-Cyl.)

1. Turn ignition off. Disconnect HO2S1 harness connector. (Scheme 13) Loosen and retighten HO2S1 to 30-37 ft. lbs. (40-50 N.m). Go to next step.
2. Check continuity between engine ground and HO2S1 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between HO2S1 harness connector terminal No. 1 and ECM harness connector terminal No. 92. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Inspect HO2S1 connectors for water. If water exists, repair or replace harness or connector. If water does not exist, go to next step.
5. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 7.
6. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1) and HO2S1 MNTR (B1). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1) voltage goes above 0.6V at least once. HO2S1 (B1) voltage goes below 0.3V at least once. HO2S1 (B1) voltage never exceeds 1.0V. If operation is as specified, go to step 8. If operation is not as specified, replace HO2S1.
7. Measure voltage between ground and ECM terminal No. 92 by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Disconnect appropriate HO2S1 harness connector. (Scheme 16) Loosen and retighten HO2S1 to 30-44 ft. lbs. (40-60 N.m). Go to next step.
2. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 91. (Scheme 12) On bank 2, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 92. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Inspect HO2S1 connectors for water. If water exists, repair or replace harness or connector. If water does not exist, go to next step.
4. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 6.
5. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1)/(B2) and HO2S1 MNTR (B1)/(B2). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1)/(B2) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1)/(B2) voltage goes above 0.6V at least once. HO2S1 (B1)/(B2) voltage goes below 0.3V at least once. HO2S1 (B1)/(B2) voltage never exceeds 1.0V. If operation is as specified, go to step 7. If operation is not as specified, replace HO2S1.
6. Measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature.
2. Stop engine and wait at least 5 seconds.
3. Turn ignition on and select HO2S1 (B1) P0133 or HO2S1 (B2) P0153 of HO2S1 in DTC WORK SUPPORT mode with CONSULT-II.
4. Touch START on CONSULT-II screen.
5. Start engine and let it idle for at least 3 minutes. NOTE: Never raise engine speed above 3600 RPM after this step. If the engine speed limit is exceeded, return to step 5 .
6. When the following conditions are met, TESTING will be displayed on CONSULT-II screen. Maintain these conditions continuously until TESTING changes to COMPLETED (it will take 40-50 seconds). ENG SPEED: 1200-3100 RPM. Vehicle speed: more than 50 MPH. B/FUEL SCHDL: 1.9-13.0 msec (on 2.5L) or 2.5-12.0 msec (on 3.5L). If TESTING is not displayed after 5 minutes, retry from step 2 .
7. Press SELF-DIAG RESULTS. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If OK is displayed, system is okay at this time.

Note. Use the following test to check overall function of HO2S1 circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine and warm to normal operating temperature. On 2.5L, measure voltage between ground and ECM terminal No. 92 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing.
2. On all models, while observing voltmeter, increase engine speed to 2000 RPM. Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE. If voltage is as specified, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Loosen and retighten HO2S1 to 30-37 ft. lbs. (40-50 N.m). (Scheme 13) Go to next step.
2. Start engine and let it idle. Check for exhaust leak before 3-way catalyst (manifold). Listen for intake leak after MAF sensor. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
3. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to step 5.
4. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to next step.
5. Turn ignition off. Disconnect HO2S1 harness connector. Check continuity between engine ground and HO2S1 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between HO2S1 harness connector terminal No. 1 and ECM harness connector terminal No. 92. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
7. Measure resistance between HO2S1 terminals No. 2 and 3. (Scheme 15) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S1 terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S1 terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S1 tests as specified, go to next step. If HO2S1 does not test as specified, replace HO2S1.
8. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 62 (White wire) by backprobing, with engine at specified speeds. See «MASS AIRFLOW SENSOR VOLTAGE (4-CYL.)»(ref-135505-S24322879922002091700000) table under DIAGNOSTIC PROCEDURE under DTC P0101: MASS AIRFLOW SENSOR. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Turn ignition off. Disconnect and reconnect MAF sensor harness connector. Repeat step 8. If voltage is still not as specified, remove MAF sensor. Check hot film for damage or dust. If problem is found, clean or replace MAF sensor as necessary. If problem is not found, go to next step.
10. With engine idling, remove PCV valve with vacuum hose connected. A hissing noise should be heard and a strong vacuum should be felt immediately when a finger is placed over valve inlet. If operation is as specified, go to next step. If operation is not as specified, replace PCV valve.
11. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
12. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1) and HO2S1 MNTR (B1). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1) voltage goes above 0.6V at least once. HO2S1 (B1) voltage goes below 0.3V at least once. HO2S1 (B1) voltage never exceeds 1.0V. If operation is as specified, go to step 14. If operation is not as specified, replace HO2S1.
13. Measure voltage between ground and ECM terminal No. 92 by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
14. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Loosen and retighten appropriate HO2S1 to 30-44 ft. lbs. (40-60 N.m). (Scheme 16) Go to next step.
2. Start engine and let it idle. Check for exhaust leak before 3-way catalyst (manifold). Listen for intake leak after MAF sensor. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
3. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step 5.
4. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 22) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to next step.
5. Turn ignition off. Disconnect appropriate HO2S1 harness connector. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 91. (Scheme 12) On bank 2, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 92. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Measure resistance between appropriate HO2S1 outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between center terminal and each outer terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S1.
7. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 62 (White wire) by backprobing, with engine at specified speeds. See «MASS AIRFLOW SENSOR VOLTAGE (V6)»(ref-135505-S25224723822002091700000) table under DIAGNOSTIC PROCEDURE under DTC P0101: MASS AIRFLOW SENSOR. If voltage is as specified, go to step 9. If voltage is not as specified, go to next step.
8. Turn ignition off. Disconnect and reconnect MAF sensor harness connector. Repeat step 7. If voltage is still not as specified, remove MAF sensor. Check hot film for damage or dust. If problem is found, clean or replace MAF sensor as necessary. If problem is not found, go to next step.
9. With engine idling, remove PCV valve with vacuum hose connected. A hissing noise should be heard and a strong vacuum should be felt immediately when a finger is placed over valve inlet. If operation is as specified, go to next step. If operation is not as specified, replace PCV valve.
10. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 12.
11. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1)/(B2) and HO2S1 MNTR (B1)/(B2). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1)/(B2) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1)/(B2) voltage goes above 0.6V at least once. HO2S1 (B1)/(B2) voltage goes below 0.3V at least once. HO2S1 (B1)/(B2) voltage never exceeds 1.0V. If operation is as specified, go to step 13. If operation is not as specified, replace HO2S1.
12. Measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
13. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature.
2. Select HO2S1 (B1) P0134 or HO2S1 (B2) P0154 in DTC WORK SUPPORT mode with CONSULT-II.
3. Press START.
4. Allow engine to idle for at least 3 minutes. NOTE: DO NOT exceed 3600 RPM. If engine speed exceeds 3600 RPM, return to step 4 .
5. When the following conditions are met, TESTING will be displayed on CONSULT-II screen: ENG SPEED: 1200-3200 RPM (4-cylinder) or 1400-2600 RPM (V6). Vehicle speed: more than 40 MPH. B/FUEL SCHDL: 1.9-13.0 msec (4-cylinder) or 2-12 msec (V6). Maintain conditions continuously until TESTING changes to COMPLETED (it will take 10-60 seconds). If TESTING is not displayed after 5 minutes, retry from step 2 .
6. Press SELF-DIAG RESULTS. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If OK is displayed, system is okay at this time.

Note. Use the following test to check overall function of HO2S1 circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine and warm to normal operating temperature. On 2.5L, measure voltage between ground and ECM terminal No. 92 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing.
2. On all models, while observing voltmeter, increase engine speed to 2000 RPM. Voltage should not remain in the.2-.4 volt range. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE. If voltage is as specified, system is okay at this time.

1. Turn ignition off. Disconnect HO2S1 harness connector. (Scheme 13) Loosen and retighten HO2S1 to 30-37 ft. lbs. (40-50 N.m). Go to next step.
2. Check continuity between engine ground and HO2S1 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between HO2S1 harness connector terminal No. 1 and ECM harness connector terminal No. 92. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Inspect HO2S1 connectors for water. If water exists, repair or replace harness or connector. If water does not exist, go to next step.
5. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 7.
6. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1) and HO2S1 MNTR (B1). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1) voltage goes above 0.6V at least once. HO2S1 (B1) voltage goes below 0.3V at least once. HO2S1 (B1) voltage never exceeds 1.0V. If operation is as specified, go to step 8. If operation is not as specified, replace HO2S1.
7. Measure voltage between ground and ECM terminal No. 92 by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect appropriate HO2S1 harness connector. (Scheme 16) Go to next step.
2. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 91. (Scheme 12) On bank 2, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 92. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 5.
4. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1)/(B2) and HO2S1 MNTR (B1)/(B2). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1)/(B2) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1)/(B2) voltage goes above 0.6V at least once. HO2S1 (B1)/(B2) voltage goes below 0.3V at least once. HO2S1 (B1)/(B2) voltage never exceeds 1.0V. If operation is as specified, go to step 6. If operation is not as specified, replace HO2S1.
5. Measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

DTC Confirmation Test (Using CONSULT-II) (4-Cylinder)

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. Let engine idle for one minute.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE (4-CYLINDER)»(ref-135505-S42697484252002091700000) . If 1st trip DTC is not detected, system is okay at this time.

DTC Confirmation Test (Using CONSULT-II) (V6)

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. Let engine idle for one minute.
2. Maintain the following conditions for at least 5 consecutive seconds: ENG SPEED: 1000-3000 RPM. VHCL SPEED SE: more than 20 MPH. B/FUEL SCHDL: 3.0-7.0 msec. COOLAN TEMP/S: 158-212°F (70-100°C).
3. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE (V6)»(ref-135505-S31530103232002091700000) . If 1st trip DTC is not detected, system is okay at this time.

DTC Confirmation Test (Using Generic Scan Tool) (4-Cylinder)

Note. Use the following test to check overall function of HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running.
2. Measure voltage between ground and ECM terminal No. 95 by backprobing. see scheme 5and (Scheme 12).
3. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should remain less than 1.4 volts during this procedure.
4. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE (4-CYLINDER)»(ref-135505-S42697484252002091700000). If voltage is as specified, system is okay at this time.

DTC Confirmation Test (Using Generic Scan Tool) (V6)

Note. Use the following test to check overall function of HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running.
2. Measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing. see scheme 5and (Scheme 12).
3. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should remain less than 1.4 volts during this procedure.
4. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE (V6)»(ref-135505-S31530103232002091700000). If voltage is as specified, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Go to next step.
2. Disconnect HO2S2 harness connector. (Scheme 13) Check continuity between engine ground and HO2S2 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 95. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 6.
5. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1) voltage should be less than.48 volt at least once. If operation is as specified, go to step 8. If operation is not as specified, replace HO2S2.
6. Measure voltage between ground and ECM terminal No. 95 by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
7. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 22) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, P0172, P0174 or P0175 is not detected and engine is not difficult to start, go to next step.
4. Disconnect appropriate HO2S2 harness connector. (Scheme 17) Check continuity between engine ground and HO2S2 harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 88. (Scheme 12) On bank 2, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 90. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 8.
7. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1)/(B2) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1)/(B2) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1)/(B2) voltage should be less than.48 volt at least once. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S2.
8. Measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Ensure COOLAN TEMP/S indicates more than 158°F (70°C).
2. Select HO2S2 (B1)/(B2) P0139/P0159 of HO2S2 in DTC WORK SUPPORT mode with CONSULT-II. Start engine. Follow instructions on CONSULT-II screen.
3. Press SELF-DIAG RESULTS. If OK is displayed, system is okay at this time. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If CANNOT BE DIAGNOSED is displayed, go to next step.
4. Stop engine. Allow engine to cool until COOLAN TEMP/S indicates less than 158°F (70°C). Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. When COOLAN TEMP/S reaches 158°F (70°C), return to step 2 .

Note. Use the following test to check overall function of HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running.
2. On 2.5L, measure voltage between ground and ECM terminal No. 95 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing.
3. On all models, while observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should change at a rate of more than.06 volt per second during this procedure.
4. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to next step.
5. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171 or P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to next step.
4. Disconnect HO2S2 harness connector. (Scheme 13) Check continuity between engine ground and HO2S2 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 95. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 8.
7. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1) voltage should be less than.48 volt at least once. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S2.
8. Measure voltage between ground and ECM terminal No. 95 by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 22) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to next step.
4. Disconnect appropriate HO2S2 harness connector. (Scheme 17) Check continuity between engine ground and HO2S2 harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 88. (Scheme 12) On bank 2, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 90. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 8.
7. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1)/(B2) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1)/(B2) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1)/(B2) voltage should be less than.48 volt at least once. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S2.
8. Measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR.
2. Select DATA MONITOR mode with CONSULT-II. Start engine and let it idle for at least 10 minutes. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, go to next step.
3. If it is difficult to start engine, fuel injection system has a malfunction. Crank engine while depressing accelerator pedal. If engine starts, go to appropriate DIAGNOSTIC PROCEDURE. If engine does not start, check for intake and exhaust leaks or spark plug fouling.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Disconnect MAF sensor harness connector. (Scheme 21)or (Scheme 22). Start engine and let it idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector.
2. Using scan tool, Select MODE 3, and ensure DTC P0102 is detected. Select MODE 4 and erase DTC. Start engine and let it idle for at least 10 minutes. Select MODE 7. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, go to next step.
3. If it is difficult to start engine, fuel injection system has a malfunction. Attempt to start engine while depressing accelerator pedal. If engine starts, go to appropriate DIAGNOSTIC PROCEDURE. If engine does not start, visually check for intake and exhaust leaks or spark plug fouling.

1. Start engine and let it idle. Check for exhaust air leaks before 3-way catalyst. Check for intake air leaks after MAF sensor. If any leaks are found, repair as necessary. If no leaks are found, go to next step.
2. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Disconnect HO2S1 harness connector. (Scheme 13) Check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 92. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Check fuel pressure. See «BASIC DIAGNOSTIC PROCEDURES»(ref-135504) article. Fuel pressure should be about 51 psi (350 kPa) at idle. If fuel pressure is okay, go to next step. If fuel pressure is not okay, repair fuel system as necessary.
4. Install all removed parts. Start engine and warm to normal operating temperature. Using CONSULT-II, select MASS AIR FLOW in DATA MONITOR mode. Using generic scan tool, select MODE 1, and read mass airflow. MAF reading should be 1-4 g/sec at idle and 4-10 g/sec at 2500 RPM. If MAF reading is as specified, go to next step. If MAF reading is not as specified, repair MAF sensor or circuit. See «DTC P0101: MASS AIRFLOW SENSOR»(ref-135505-S05008045262002091300000).
5. Allow engine to idle. Using CONSULT-II, perform POWER BALANCE in ACTIVE TEST mode. Each circuit should produce a momentary engine speed drop. If not using CONSULT-II, listen to each fuel injector. Clicking noise should be heard from each injector. If operation is as specified, go to next step. If operation is not as specified, diagnose and repair fuel injector circuits. See «FUEL SYSTEM»(ref-135812-S07490309292002022500000) in SYSTEM & COMPONENT TESTING article.
6. Turn ignition off. Allow engine to cool and ensure no fire hazards exist. Remove injector assembly, keeping fuel hose and all injectors connected to injector gallery. Place a suitable cup under each injector to collect fuel. Disconnect injector harness connectors. Disconnect all ignition coil harness connectors. Turn ignition on. Ensure fuel does not drip from any injector. If fuel drips from any injector, replace injector from which fuel is dripping. Crank engine for 3 seconds. Ensure each injector sprays fuel. Replace any injector from which fuel does not spray. If all injectors are okay, go to next step.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and let it idle. Check for exhaust air leaks before 3-way catalyst. Check for intake air leaks after MAF sensor. If any leaks are found, repair as necessary. If no leaks are found, go to next step.
2. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Disconnect appropriate HO2S1 harness connector. (Scheme 16) On bank 1, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 91. (Scheme 12) On bank 2, check continuity of White wire between HO2S1 harness connector terminal No. 2 and ECM harness connector terminal No. 92. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Check fuel pressure. See «BASIC DIAGNOSTIC PROCEDURES»(ref-135504) article. Fuel pressure should be about 51 psi (350 kPa) at idle. If fuel pressure is okay, go to next step. If fuel pressure is not okay, repair fuel system as necessary.
4. Install all removed parts. Start engine and warm to normal operating temperature. Using CONSULT-II, select MASS AIR FLOW in DATA MONITOR mode. Using generic scan tool, select MODE 1, and read mass airflow. MAF reading should be 2-6 g/sec at idle and 7-20 g/sec at 2500 RPM. If MAF reading is as specified, go to next step. If MAF reading is not as specified, repair MAF sensor or circuit. See «DTC P0101: MASS AIRFLOW SENSOR»(ref-135505-S05008045262002091300000).
5. Allow engine to idle. Using CONSULT-II, perform POWER BALANCE in ACTIVE TEST mode. Each circuit should produce a momentary engine speed drop. If not using CONSULT-II, listen to each fuel injector. Clicking noise should be heard from each injector. If operation is as specified, go to next step. If operation is not as specified, diagnose and repair fuel injector circuits. See «FUEL SYSTEM»(ref-135812-S07490309292002022500000) in SYSTEM & COMPONENT TESTING article.
6. Turn ignition off. Allow engine to cool and ensure no fire hazards exist. Remove injector assembly, keeping fuel hose and all injectors connected to injector gallery. Place a suitable cup under each injector to collect fuel. Disconnect injector harness connectors on bank 2 (for DTC P0171 or DTC P0172) or bank 1 (for DTC P0174 or DTC P0175). Disconnect all ignition coil harness connectors. Turn ignition on. Ensure fuel does not drip from any injector. If fuel drips from any injector, replace injector from which fuel is dripping. Crank engine for 3 seconds. Ensure each injector sprays fuel. Replace any injector from which fuel does not spray. If all injectors are okay, go to next step.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

DTC Confirmation Test (DTC P0181)

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Wait at least 10 seconds. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00515256702002091800000) . If 1st trip DTC is not detected, go to next step.
2. Read COOLAN TEMP/S value. If COOLAN TEMP/S is more than 140°F (60°C), allow engine to cool until COOLAN TEMP/S is less than 140°F (60°C).
3. Wait at least 10 seconds. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00515256702002091800000) . If 1st trip DTC is not detected, system is okay at this time.

DTC Confirmation Test (DTC P0182 & DTC P0183)

Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Wait at least 5 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Disconnect fuel pump assembly harness connector. Access cover is located under rear seat. Measure voltage between ground and fuel pump assembly harness connector terminal "T" (Pink/Blue wire). (Scheme 28) If voltage is about 5 volts, go to step 3. If voltage is not about 5 volts, go to next step.
2. Check the following: Check for poor connection at White, 16-pin connector M12 terminal No. 1 (Pink/Blue wire). (Scheme 29) Connector M12 is located under left side of instrument panel. see scheme 16 Check for poor connection at White, 24-pin connector F59 terminal No. 19 (Pink/Blue wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check for open or short between fuel pump assembly and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between body ground and fuel pump assembly harness connector terminal "E" (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at White, 16-pin connector M12 terminal No. 2 (Black wire). (Scheme 29) Connector M12 is located under left side of instrument panel. see scheme 16 Check for open or short between fuel pump assembly and body ground. Repair as necessary.
5. Remove fuel pump assembly. Measure resistance between fuel pump assembly connector terminals "T" and "E", with FTT sensor submerged in heated water. (Scheme 31) Resistance should be within acceptable range shown in illustration. (Scheme 25) If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Note. Use the following test to check overall function of coolant overtemperature enrichment protection. During this test, DTC may not be confirmed.

1. Allow engine to cool. Check coolant level in radiator and reservoir tank. If coolant level is okay, go to next step. If coolant level is low, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00987467202002091800000).
2. Check coolant mixture ratio. If coolant mixture ratio is 45-55 percent, go to next step. If coolant mixture ratio is not 45-55 percent, change coolant, then go to step 4.
3. If coolant was filled by customer, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00987467202002091800000). If coolant was not filled by customer, go to next step.
4. Start engine and let it idle. Turn A/C switch to OFF position. Ensure A/C system is not operating. If A/C is operating, repair A/C circuit. See appropriate article in AIR CONDITIONING & HEATING. If A/C system is not operating, go to next step.
5. With engine idling, perform ENG COOLANT TEMP in ACTIVE TEST mode with CONSULT-II. Set ENG COOLANT TEMP to 203°F (95°C). If cooling fans operate at low speed, go to next step. If cooling fans do not operate at low speed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00987467202002091800000).
6. Set ENG COOLANT TEMP to 212°F (100°C). If cooling fans operate at high speed, go to next step. If cooling fans do not operate at high speed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00987467202002091800000). After repair, go to next step.
7. Check for blocked coolant or radiator air passage. If problem is found, repair as necessary. If problem is not found, go to next step.
8. Remove ECT sensor, and place in heated water. For location (Scheme 26) Measure resistance between sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE»(ref-135505-S15791428152002022200000) table under DIAGNOSTIC PROCEDURE under DTC P0117 OR DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR. If resistance is as specified, go to next step. If resistance is not as specified, replace ECT sensor.
9. Check ignition timing. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article. Ignition timing should be 10-20 degrees BTDC at idle. If ignition timing is okay, system is okay at this time. If ignition timing is not okay, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.

Note. Use the following test to check overall function of coolant overtemperature enrichment protection. During this test, DTC may not be confirmed.

1. Allow engine to cool. Check coolant level in radiator and reservoir tank. If coolant level is okay, go to next step. If coolant level is low, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00987467202002091800000).
2. Check coolant mixture ratio. If coolant mixture ratio is 45-55 percent, go to next step. If coolant mixture ratio is not 45-55 percent, change coolant, then go to step 4.
3. If coolant was filled by customer, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00987467202002091800000). If coolant was not filled by customer, go to next step.
4. Start engine and let it idle. Turn A/C switch to OFF position. Ensure A/C system is not operating. If A/C is operating, repair A/C circuit. See appropriate article in AIR CONDITIONING & HEATING. If A/C system is not operating, go to next step.
5. Turn ignition off. Disconnect ECT sensor harness connector. (Scheme 26) Connect a 150 ohm resistor between ECT sensor harness connector terminals. Start engine. If cooling fans operate, go to next step. If cooling fans do not operate, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S00987467202002091800000).
6. Check for blocked coolant or radiator air passage. If problem is found, repair as necessary. If problem is not found, go to next step.
7. Remove ECT sensor, and place in heated water. For location (Scheme 26) Measure resistance between sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE»(ref-135505-S15791428152002022200000) table under DIAGNOSTIC PROCEDURE under DTC P0117 OR DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR. If resistance is as specified, go to next step. If resistance is not as specified, replace ECT sensor.
8. Check ignition timing. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article. Ignition timing should be 10-20 degrees BTDC at idle. If ignition timing is okay, system is okay at this time. If ignition timing is not okay, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.

1. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
2. Start engine and let it idle. Select COOLING FAN in ACTIVE TEST mode with CONSULT-II. Press LOW on CONSULT-II screen. If cooling fans operate at low speed, go to next step. If cooling fans do not operate at low speed, go to «COOLING FAN LOW SPEED CIRCUIT»(ref-135505-S23993710162002091800000).
3. Press HIGH on CONSULT-II screen. If cooling fans operate at high speed, go to step 6. If cooling fans do not operate at high speed, go to «COOLING FAN HIGH SPEED CIRCUIT»(ref-135505-S13328038992002091800000).
4. Start engine and let it idle. Turn A/C and blower on. If cooling fans operate at low speed, go to next step. If cooling fans do not operate at low speed, go to «COOLING FAN LOW SPEED CIRCUIT»(ref-135505-S23993710162002091800000).
5. Turn ignition off. Turn A/C and blower off. Disconnect ECT sensor harness connector. (Scheme 26) Connect a 150 ohm resistor between ECT sensor harness connector terminals. Start engine. If cooling fans operate at high speed, go to next step. If cooling fans do not operate at high speed, go to «COOLING FAN HIGH SPEED CIRCUIT»(ref-135505-S13328038992002091800000).
6. Pressure test cooling system and radiator cap. Check thermostat operation. Radiator cap relief pressure should be 8.6-14.2 psi (59-98 kPa). Thermostat opening temperature should be 180°F (82°C). Repair coolant leaks or replace radiator cap or thermostat as necessary. If no problems are found, go to next step.
7. Remove ECT sensor, and place in heated water. Measure resistance between sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE»(ref-135505-S15791428152002022200000) table under DIAGNOSTIC PROCEDURE under DTC P0117 OR DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR. If resistance is not as specified, replace ECT sensor. If resistance is as specified, check for other possible causes of engine overheating and repair as necessary.

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for one second. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Disconnect electric throttle control actuator harness connector. (Scheme 32) Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). (Scheme 33) If voltage is about 5 volts, go to step 3. If voltage is not about 5 volts, go to next step.
2. Check the following: Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14 Check for open or short between electric throttle control actuator and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and electric throttle control actuator harness connector terminal No. 5 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for open or short between electric throttle control actuator and ECM. On A/T models, check for open or short between electric throttle control actuator and transmission control module. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between electric throttle control actuator harness connector terminal No. 4 and ECM harness connector terminal No. 73. (Scheme 12) Check continuity of Green wire between electric throttle control actuator harness connector terminal No. 2 and ECM harness connector terminal No. 74. Also, check circuits for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Perform throttle valve closed position learning. See «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-135505-S20463220872002101400000) under PROGRAMMING. Turn ignition on. Shift transmission into Drive (A/T models) or first gear (M/T models). Measure voltage between ground and ECM terminals No. 73 (TP sensor No. 1 signal) and No. 74 (TP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «TP SENSOR VOLTAGE (4-CYLINDER)»(ref-135505-S37022328102002021100000) table. If voltage is as specified, go to next step. If voltage is not as specified, replace electric throttle control actuator.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 32

Scheme 33

TP SENSOR VOLTAGE (4-CYLINDER)

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect electric throttle control actuator harness connector. (Scheme 34) Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). (Scheme 33) If voltage is about 5 volts, go to step 3. If voltage is not about 5 volts, go to next step.
2. Check the following: Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 15 Check for open or short between electric throttle control actuator and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and electric throttle control actuator harness connector terminal No. 5 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for open or short between electric throttle control actuator and ECM. On A/T models, check for open or short between electric throttle control actuator and transmission control module. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between electric throttle control actuator harness connector terminal No. 4 and ECM harness connector terminal No. 83. (Scheme 12) Check continuity of Green wire between electric throttle control actuator harness connector terminal No. 2 and ECM harness connector terminal No. 84. Also, check circuits for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Perform throttle valve closed position learning. See «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-135505-S20463220872002101400000) under PROGRAMMING. Turn ignition on. Shift transmission into Drive (A/T models) or first gear (M/T models). Measure voltage between ground and ECM terminals No. 73 (TP sensor No. 1 signal) and No. 74 (TP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «TP SENSOR VOLTAGE (V6)»(ref-135505-S29275684592002091900000) table. If voltage is as specified, go to next step. If voltage is not as specified, replace electric throttle control actuator.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 34

TP SENSOR VOLTAGE (V6)

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for one second. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Disconnect APP sensor harness connector. (Scheme 35) Measure voltage between ground and APP sensor harness connector terminals No. 1 (Orange wire) and No. 2 (Red wire). (Scheme 36) About 2.5 volts should exist at terminal No. 1, and about 5 volts should exist at terminal No. 2. If voltage is as specified, go to step 3. If voltage is not as specified, go to next step.
2. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminals No. 4 (Red wire) and No. 6 (Orange wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 14 Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14 Check for open or short between APP sensor and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and APP sensor harness connector terminals No. 4 and 5 (both Green wires). Continuity should exist. Also, check circuits for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminals No. 3 (Black wire) and No. 8 (Green wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 14 Check for open or short between APP sensor and ECM. On A/T models, check for open or short between APP sensor and transmission control module. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity between APP sensor harness connector terminal No. 3 (Red wire) and ECM harness connector terminal No. 75 (White wire). (Scheme 12) Check continuity of White/Black wire between APP sensor harness connector terminal No. 6 and ECM harness connector terminal No. 76. Also, check circuits for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 7.
6. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminals No. 5 (White wire) and No. 2 (White/Black wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 14 Check for open or short between APP sensor and ECM. Repair as necessary.
7. Reconnect all harness connectors. Turn ignition on. Measure voltage between ground and ECM terminals No. 75 (APP sensor No. 1 signal) and No. 76 (APP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «APP SENSOR VOLTAGE (4-CYLINDER)»(ref-135505-S36450797752002041200000) table. If voltage is as specified, go to next step. If voltage is not as specified, replace APP sensor.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 35

Scheme 36

Scheme 37

APP SENSOR VOLTAGE (4-CYLINDER)

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect APP sensor harness connector. (Scheme 35) Measure voltage between ground and APP sensor harness connector terminals No. 1 (Orange wire) and No. 2 (Red wire). (Scheme 36) About 2.5 volts should exist at terminal No. 1, and about 5 volts should exist at terminal No. 2. If voltage is as specified, go to step 3. If voltage is not as specified, go to next step.
2. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminals No. 4 (Red wire) and No. 6 (Orange wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 15 Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 15 Check for open or short between APP sensor and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and APP sensor harness connector terminals No. 4 (Black wire) and No. 5 (Green wire). Continuity should exist. Also, check circuits for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminals No. 3 (Black wire) and No. 8 (Green wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 15 Check Blue, 12-pin joint connector No. 5 (connector F52). (Scheme 24) Connector F52 is located near ECM. see scheme 15 Check for open or short between APP sensor and ECM. On A/T models, check for open or short between APP sensor and transmission control module. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between APP sensor harness connector terminal No. 3 and ECM harness connector terminal No. 73. (Scheme 12) Check continuity of White/Black wire between APP sensor harness connector terminal No. 6 and ECM harness connector terminal No. 74. Also, check circuits for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 7.
6. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminals No. 5 (White wire) and No. 2 (White/Black wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 15 Check for open or short between APP sensor and ECM. Repair as necessary.
7. Reconnect all harness connectors. Turn ignition on. Measure voltage between ground and ECM terminals No. 73 (APP sensor No. 1 signal) and No. 74 (APP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «APP SENSOR VOLTAGE (V6)»(ref-135505-S31712546992002091900000) table. If voltage is as specified, go to next step. If voltage is not as specified, replace APP sensor.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

APP SENSOR VOLTAGE (V6)

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Drive vehicle for at least 3 minutes with engine at 1500-3000 RPM. Hold accelerator pedal as steady as possible.

Note. Refer to freeze frame data for test driving conditions.

If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Start engine and let it idle. Check for intake leaks. Stop engine and visually inspect exhaust system, 3-way catalyst and muffler for blockage. If problem is found, repair as necessary. If problem is not found, go to next step.
2. If using CONSULT-II, go to next step. If using generic scan tool, go to step 4.
3. Perform POWER BALANCE in ACTIVE TEST mode with CONSULT-II. If there is any cylinder which does not produce a momentary engine speed drop, go to step 6. If all cylinders produce a momentary engine speed drop, go to step 5.
4. Start engine and let it idle. Individually, disconnect fuel injector harness connectors. If there is any cylinder which does not produce a momentary engine speed drop, go to step 6. If all cylinders produce a momentary engine speed drop, go to next step.
5. Listen to each fuel injector. If every injector clicks, go to next step. If any injector does not click, repair injector or circuit as necessary. See «FUEL SYSTEM»(ref-135812-S07490309292002022500000) in SYSTEM & COMPONENT TESTING article.
6. Turn ignition off. Disconnect spark plug wire from spark plug. Connect a known good spark plug. Place end of spark plug against a suitable ground and crank engine. If spark is detected, go to next step. If no spark is detected, check ignition coil, power transistor and their related circuits. See «IGNITION SYSTEM»(ref-135812-S30814659162002022500000) in SYSTEM & COMPONENT TESTING article.
7. Remove spark plugs. Inspect spark plugs for fouling or other damage. If problem is found, repair or replace spark plugs as necessary. If spark plugs are okay, go to next step.
8. Check compression. See «BASIC DIAGNOSTIC PROCEDURES»(ref-135504) article. See appropriate COMPRESSION SPECIFICATIONS table. If compression is as specified, go to next step. If compression is not as specified, check pistons, piston rings, valves, valve seats and cylinder head gaskets. Repair as necessary.
9. Check fuel pressure. See «BASIC DIAGNOSTIC PROCEDURES»(ref-135504) article. Fuel pressure should be about 51 psi (350 kPa) at idle. If fuel pressure is okay, go to next step. If fuel pressure is not okay, repair fuel system as necessary. See «FUEL SYSTEM»(ref-135812-S07490309292002022500000) in SYSTEM & COMPONENT TESTING article.
10. Check target idle speed and ignition timing. See ON-VEHICLE ADJUSTMENTS article. If ignition timing and target idle speed are okay, go to next step. If ignition timing or target idle speed is not okay, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.
11. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
12. Select MANU TRIG and HI SPEED in DATA MONITOR mode with CONSULT- II. Select HO2S1 (B1)/(B2) and HO2S1 MNTR (B1)/(B2). Hold engine speed at 2000 rpm under no load. Touch RECORD on CONSULT-II screen. The following should occur: HO2S1 MNTR (B1)/(B2) in DATA MONITOR mode changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1)/(B2) voltage goes above 0.6V at least once. HO2S1 (B1)/(B2) voltage goes below 0.3V at least once. HO2S1 (B1)/(B2) voltage never exceeds 1.0V. If operation is as specified, go to step 14. If operation is not as specified, replace appropriate HO2S1.
13. On 2.5L, measure voltage between ground and ECM terminal No. 92 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 91 (bank 1) and No. 92 (bank 2) by backprobing. On all models, increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace appropriate HO2S1.
14. Select DATA MONITOR or MODE 1 with scan tool, and read Mass Airflow (MAF) signal. On 2.5L, MAF reading should be 1.4-4.0 grams per second at idle and 4.0-10.0 grams per second at 2500 RPM. On 3.5L, MAF reading should be 2-6 grams per second at idle and 7-20 grams per second at 2500 RPM. On all models, if MAF reading is as specified, go to step 16. If MAF reading is not as specified, go to next step.
15. Check connectors for rusted terminals or loose connections in MAF sensor circuit or engine grounds. See «DTC P0102 OR DTC P0103: MASS AIRFLOW SENSOR»(ref-135505-S15148452762002091600000). Repair as necessary.
16. Check for possible causes of rough idle. See «ROUGH IDLE»(ref-135811-S35504487742002022500000) under SYMPTOMS in TROUBLE SHOOTING - NO CODES article. If a problem is found, repair as necessary. If a problem is not found, go to next step.
17. Some tests that were performed may cause a 1st trip DTC to set. Clear 1st trip DTC as necessary. Go to next step.
18. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

COMPRESSION SPECIFICATIONS (4-CYLINDER)

COMPRESSION SPECIFICATIONS (V6)

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and let it idle for at least 5 seconds. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Measure resistance between engine ground and ECM harness connector terminal No. 82 (White wire). (Scheme 12) Resistance should be about 530-590 k/ohms at 68°F (20°C). If resistance is as specified, go to step 4. If resistance is not as specified, go to next step.
2. Disconnect knock sensor harness connector. (Scheme 38) Check continuity of White wire between knock sensor harness connector terminal No. 1 and ECM harness connector terminal No. 82. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Measure resistance between ground and knock sensor terminal No. 1. Resistance should be 530-590 k/ohms at 68°F (20°C). If resistance is as specified, go to step 5. If resistance is not as specified, replace knock sensor.
4. Loosen and retighten engine ground bolts. (Scheme 19) Go to next step.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 38

1. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Measure resistance between engine ground and ECM harness connector terminal No. 71 (White wire). (Scheme 12) Resistance should be about 530-590 k/ohms at 68°F (20°C). If resistance is as specified, go to step 4. If resistance is not as specified, go to next step.
2. Disconnect knock sensor harness connector. (Scheme 39) Check continuity of White wire between knock sensor harness connector terminal No. 1 and ECM harness connector terminal No. 71. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 4.
3. Check the following: Check for poor connection at Black, 2-pin connector F26 terminal No. 1 (White wire). Connector F26 is located on top of engine. see scheme 15 Check for open or short between knock sensor and ECM. Repair as necessary.
4. Measure resistance between ground and knock sensor terminal No. 1. Resistance should be 530-590 k/ohms at 68°F (20°C). If resistance is as specified, go to step 6. If resistance is not as specified, replace knock sensor.
5. Loosen and retighten engine ground bolts. (Scheme 20) Go to next step.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 39

Note. Before proceeding, ensure battery voltage is more than 10.5 volts with ignition on.

1. Turn ignition on. Select DATA MONITOR mode with scan tool. Crank engine for at least 2 seconds and run it for at least 5 seconds at idle speed.
2. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, go to next step.
3. Maintain engine speed at more than 800 RPM for at least 5 seconds. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Disconnect CKP sensor (POS) harness connector. (Scheme 40) Turn ignition on. Measure voltage between ground and CKP sensor (POS) harness connector terminal No. 1 (Red/Green wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 6B (Red/Green wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 4 (Red/Green wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14 Check for open or short between CKP sensor (POS) and ECM. Check for open or short between CKP sensor (POS) and Intelligent Power Distribution Module (IPDM). IPDM is located on right side of engine compartment. see scheme 10and see scheme 12. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and CKP sensor (POS) harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check Blue, 12-pin joint connector No. 5 (connector F52). (Scheme 24) Connector F52 is located near ECM. see scheme 14 Check for open or short between CKP sensor (POS) and engine ground. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between CKP sensor (POS) harness connector terminal No. 2 and ECM harness connector terminal No. 71. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Remove CKP sensor (POS). Visually inspect sensor for chipping. Measure resistance between sensor terminals as shown in illustration. (Scheme 41) Replace sensor if it is chipped or if resistance is not as specified. If sensor is okay, go to next step.
7. Visually inspect signal plate teeth for chipping. Replace, if chipped. If signal plate is okay, go to next step.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 40

Scheme 41

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect CKP sensor (POS) harness connector. (Scheme 42) Turn ignition on. Measure voltage between ground and CKP sensor (POS) harness connector terminal No. 1 (Red/Green wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 6B (Red/Green wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 4 (Red/Green wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 15 Check for open or short between CKP sensor (POS) and ECM. Check for open or short between CKP sensor (POS) and Intelligent Power Distribution Module (IPDM). IPDM is located on right side of engine compartment. see scheme 10and see scheme 12. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and CKP sensor (POS) harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between CKP sensor (POS) harness connector terminal No. 2 and ECM harness connector terminal No. 95. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Remove CKP sensor (POS). Visually inspect sensor for chipping. Measure resistance between sensor terminals as shown in illustration. (Scheme 41) Replace sensor if it is chipped or if resistance is not as specified. If sensor is okay, go to next step.
6. Visually inspect signal plate teeth for chipping. Replace, if chipped. If signal plate is okay, go to next step.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 42

1. Turn ignition on. Select DATA MONITOR mode with scan tool. Crank engine for at least 2 seconds and run it for at least 5 seconds at idle speed.
2. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, go to next step.
3. Maintain engine speed at more than 800 RPM for at least 5 seconds. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition switch to START position. If engine cranks, go to next step. If engine does not crank, repair starting system. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
2. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Disconnect CMP sensor harness connector. (Scheme 43) Turn ignition on. Measure voltage between ground and CMP sensor harness connector terminal No. 1 (Red/Green wire). If battery voltage exists, go to step 4. If battery voltage does not exist, go to next step.
3. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 6B (Red/Green wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 4 (Red/Green wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14 Check for open or short between CMP sensor and ECM. Check for open or short between CMP sensor and Intelligent Power Distribution Module (IPDM). IPDM is located on right side of engine compartment. see scheme 10and see scheme 12. Repair as necessary.
4. Check continuity between engine ground and CMP sensor harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 6.
5. Check the following: Check Blue, 12-pin joint connector No. 5 (connector F52). (Scheme 24) Connector F52 is located near ECM. see scheme 14 Check for open or short between CMP sensor and engine ground. Repair as necessary.
6. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between CMP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 62. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
7. Remove CMP sensor. Visually inspect sensor for chipping. Measure resistance between sensor terminals as shown in illustration. (Scheme 41) Replace sensor if it is chipped or if resistance is not as specified. If sensor is okay, go to next step.
8. Visually inspect signal plate teeth for chipping or accumulation of debris. Clean or replace camshaft as necessary. If signal plate is okay, go to next step.
9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 43

1. Turn ignition switch to START position. If engine cranks, go to next step. If engine does not crank, repair starting system. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
2. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect appropriate CMP sensor harness connector. (Scheme 44) Turn ignition on. Measure voltage between ground and appropriate CMP sensor harness connector terminal No. 3 (Red/Green wire). If battery voltage exists, go to step 4. If battery voltage does not exist, go to next step.
3. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 6B (Red/Green wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 4 (Red/Green wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 15 Check for open or short between CMP sensor and ECM. Check for open or short between CMP sensor and Intelligent Power Distribution Module (IPDM). IPDM is located on right side of engine compartment. see scheme 10and see scheme 12. Repair as necessary.
4. Check continuity between engine ground and CMP sensor harness connector terminal No. 1 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of Yellow wire between CMP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 65. (Scheme 12) On bank 2, check continuity of Green wire between CMP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 85. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Remove CMP sensor. Visually inspect sensor for chipping. Measure resistance between sensor terminals as shown in illustration. (Scheme 41) Replace sensor if it is chipped or if resistance is not as specified. If sensor is okay, go to next step.
7. Visually inspect signal plate teeth for chipping or accumulation of debris. Clean or replace camshaft as necessary. If signal plate is okay, go to next step.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 44

Note. Open hood before conducting the following procedure. DO NOT keep engine at specified speeds longer than the specified times.

1. Turn ignition on. Select DTC & SRT CONFIRMATION then SRT WORK SUPPORT mode with CONSULT-II. Start engine. Hold engine speed at 2500-3500 RPM for 3 consecutive minutes. Release accelerator pedal completely.
2. Let engine idle for 5 seconds, then hold engine speed at 2000-3000 RPM until INCMP of CATALYST changes to CMPLT (it will take about 5 minutes).
3. If CMPLT is not displayed, stop engine and cool to less than 158°F (70°C), then retest from step 1 . Select SELF-DIAG RESULTS mode with CONSULT-II.
4. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S41188013162002092300000) . If 1st trip DTC is not detected, system is okay at this time.

Note. Use the following test to check overall function of warm-up 3-way catalyst. During this test, 1st trip DTC may not be confirmed.

1. Start engine and drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle and leave engine running. On 2.5L, measure voltage between ground and ECM terminal No. 92 (HO2S1 signal) and No. 95 (HO2S2 signal) by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and HO2S1 signal circuit at ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. Also, measure voltage between ground and HO2S2 signal circuit at ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing.
2. On all models, increase engine speed to 2000 RPM. If switching frequency of HO2S2 is less than 75 percent of HO2S1 switching frequency, catalyst is operating properly. If switching frequency of HO2S2 is not less than 75 percent of HO2S1 switching frequency, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S41188013162002092300000). If HO2S1 does not switch more than 5 times within 10 seconds, diagnose and repair HO2S1. See «DTC P0133 OR DTC P0153: HO2S1»(ref-135505-S21721162582002091700000).

1. Visually inspect exhaust system for damage. Start engine and let it idle. Check for exhaust leak prior to 3-way catalyst. Also, check for intake air leak after MAF sensor. If problem is found, repair as necessary. If problem is not found, go to next step.
2. Check ignition timing and target idle speed. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article. If ignition timing and target idle speed are okay, go to next step. If ignition timing and target idle speed are not okay, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.
3. Turn engine off. Turn ignition on. On 2.5L, measure voltage between ground and ECM terminals No. 101 (Red/Black wire), No. 102 (Red/White wire), No. 103 (Red/Yellow wire) and No. 104 (Red/Blue wire) by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminals No. 1 (Red/Black wire), No. 2 (Red/White wire), No. 3 (Red/Yellow wire), No. 11 (Red/Blue wire), No. 12 (Blue/White wire) and No. 13 (Purple/Red wire) by backprobing. On all models, if battery voltage exists on all circuits, go to next step. If battery voltage does not exist on all circuits, repair appropriate injector circuit(s). See «SYSTEM & COMPONENT TESTING»(ref-135812) article.
4. Turn ignition off. Remove ignition coils from rocker covers. Connect a known-good spark plug to coil and ground spark plug end. Crank engine and check for spark. If spark exists at all coils, go to next step. If spark does not exist at any coil, repair ignition system. See «SYSTEM & COMPONENT TESTING»(ref-135812) article.
5. Turn ignition off. Remove injector assembly, keeping fuel hose and all injectors connected. Disconnect all ignition coil harness connectors. Turn ignition on. Verify fuel is not dripping from any injectors. Replace any injectors from which fuel is dripping. If all injectors are okay, go to next step.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature.
2. Turn ignition off and wait at least 10 seconds.
3. Start engine and let it idle for at least 70 seconds.
4. Select PURG FLOW P0441 of EVAPORATIVE SYSTEM in DTC CONFIRMATION mode with CONSULT-II.
5. Press START. If COMPLETED is displayed, go to step 7 . If COMPLETED is not displayed, go to next step.
6. When the following conditions are met, TESTING will be displayed on CONSULT-II screen: Vehicle speed: 20-75 MPH. ENG SPEED: 500-3800 RPM (on 2.5L) or 500-3000 RPM (on 3.5L). B/FUEL SCHDL: 1.0-10.0 msec (on 2.5L) or 1.3-9.0 msec (on 3.5L). Engine coolant temperature: 158-212°F (70-100°C). Maintain conditions continuously until TESTING changes to COMPLETED (it will take at least 35 seconds). NOTE: If TESTING does not change to COMPLETED, retry from step 2 .
7. Press SELF-DIAG RESULTS. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S05976518902002092300000) . If OK is displayed, system is okay at this time.

Note. Use the following test to check overall function of EVAP control system purge flow monitoring. During this test, 1st trip DTC may not be confirmed.

1. Raise drive wheels. Start engine (TCS switch in OFF position) and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Start engine and wait at least 70 seconds. Measure and record voltage between ground and EVAP-CSPS signal circuit at ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. see scheme 5and (Scheme 12).
3. While monitoring voltage, maintain the following conditions for at least one minute: A/C switch: ON position. Steering wheel: fully turned. Headlight switch: ON position. Rear window defogger switch: ON position. Engine speed: about 3000 RPM. Transmission: any forward gear. Voltage should remain.1 volt less than voltage measured at idle for at least one second.
4. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S05976518902002092300000).

1. Turn ignition off. Inspect EVAP canister for cracks. (Scheme 45) Replace, if cracked. If EVAP canister is not cracked, go to next step.
2. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
3. Disconnect vacuum hose connected to EVAP-CPVCSV at EVAP service port. (Scheme 46)or (Scheme 47). Connect vacuum gauge to disconnected hose. Start engine and let it idle. Select PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Increase engine speed to 2000 RPM. Press "Qd" and "Qu" on CONSULT-II screen to adjust PURG VOL CONT/V opening. When opening is 100 percent, vacuum should exist. When opening is zero percent, vacuum should not exist. If vacuum is as specified, go to step 8. If vacuum is not as specified, go to step 5.
4. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose connected to EVAP-CPVCSV at EVAP service port. (Scheme 46)or (Scheme 47). Connect vacuum gauge to disconnected hose. Start engine and let it idle for at least 80 seconds. Check for vacuum while increasing engine speed to 2000 RPM. Vacuum should exist. Release throttle and let engine idle. Vacuum should not exist. If vacuum is as specified, go to step 8. If vacuum is not as specified, go to next step.
5. Turn ignition off. Check EVAP purge line for improper connection or disconnection. See «VACUUM DIAGRAMS»(ref-135815) article. Check for blockage in hoses connected to EVAP service port and EVAP-CPVCSV. Also, check intake manifold purge port for blockage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. If using CONSULT-II, go to next step. If using generic scan tool, go to step 8.
7. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 9. If operation is not as specified, go to next step.
8. Turn ignition off. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage to EVAP-CPVCSV terminals. (Scheme 48) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
9. Check for disconnection or improper connection of hose connected to EVAP-CSPS. If problem is found, repair as necessary. If problem is not found, go to next step.
10. Disconnect EVAP-CSPS harness connector. Check connectors for water. If water exists, replace EVAP-CSPS. If water does not exist, go to next step.
11. Check EVAP-CSPS function by performing appropriate DTC CONFIRMATION TEST under DTC P0452: EVAP CONTROL SYSTEM PRESSURE SENSOR. If 1st trip DTC is detected, replace EVAP-CSPS. If 1st trip DTC is not detected, go to next step.
12. Disconnect hose from EVAP-CVCV. Check hose for blockage. If blockage is found, clean with compressed air. If blockage is not found, go to next step.
13. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
14. If using CONSULT-II, go to next step. If using generic scan tool, go to step 16.
15. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 17. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
16. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
17. Inspect EVAP purge line for evidence of leaks. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair as necessary. If problem is not found, clean purge line with compressed air, and go to next step.
18. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Note. Before performing test, ensure fuel tank level is 1/4-3/4, ambient temperature is 32-86°F (0-32°C) and EVAP-CPVCSV hoses are installed correctly. Open hood before proceeding.

1. Turn ignition on. Turn ignition off and wait at least 10 seconds. Turn ignition on and select DATA MONITOR mode with CONSULT-II.
2. Ensure the following conditions are met: COOLAN TEMP/S: 32-158°F (0-70°C). INT/A TEMP SE: 32-86°F (0-30°C).
3. Select EVP SML LEAK P0442/P1442 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT- II. Follow instructions displayed. NOTE: If engine speed cannot be maintained within range displayed on CONSULT-II screen, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.
4. If OK is displayed on CONSULT-II, system is okay at this time. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S32886501052002092400000) .

Note. Before performing test, ensure fuel tank level is 1/4-3/4, ambient temperature is 32-86°F (0-32°C) and EVAP-CPVCSV hoses are installed correctly.

1. Start engine. Drive vehicle according to specified driving pattern to set System Readiness Test (SRT) codes. See «SYSTEM READINESS TEST»(ref-135505-S05390287112002022200000) under SELF-DIAGNOSTIC SYSTEM. Stop vehicle and go to next step.
2. Select MODE 1 on scan tool and check SRT status of EVAP system. If EVAP system SRT is complete, system is okay at this time. If EVAP system SRT is incomplete, turn ignition off, wait at least 10 seconds and go to next step.
3. Perform driving pattern again. Select MODE 3 on scan tool. If DTC P0442 is set, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S32886501052002092400000) . If DTC P0441 is set, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S05976518902002092300000) under DTC P0441: EVAP CONTROL SYSTEM. If DTC P0441 or DTC P0442 is not set, go to next step.
4. Select MODE 1 with scan tool. If EVAP system SRT is complete, system is okay at this time. If EVAP system SRT is not complete, go to step 3 .

1. Ensure fuel cap is original equipment. Attempt to turn fuel cap clockwise. If fuel cap was tightened properly, go to next step. If fuel cap was not tightened properly, clean fuel cap and filler neck with compressed air.
2. While removing fuel cap, listen for air escaping from fuel tank. If air escaped from fuel tank, go to step 4. If air did not escape from fuel tank, go to next step.
3. Using a suitable hand vacuum/pressure pump with Fuel Filler Cap Adapter (MLR-8382), apply pressure and vacuum to fuel cap. Fuel cap vacuum relief valve should open when pressure reaches 2.22-2.90 psi (15.3-20.0 kPa) and when vacuum reaches.98-1.78 in. Hg (3.3-6.0 kPa). If operation is as specified, go to next step. If operation is not as specified, replace fuel cap.
4. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 46)or (Scheme 47). Connect a suitable pressure pump to adapter. DO NOT use compressed air. If using CONSULT-II, go to next step. If using generic scan tool, go to step 6.
5. Turn ignition on. Select EVAP SYSTEM CLOSE of WORK SUPPORT mode with CONSULT-II. Press START. Observe pressure indicator on CONSULT-II. Apply pressure to EVAP system until pressure indicator reaches middle of bar graph. DO NOT exceed.6 psi (4.12 kPa) of pressure. Using Leak Detector (J41416), locate EVAP leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to step 7.
6. Turn ignition off. Disconnect EVAP Canister Vent Control Valve (EVAP-CVCV) and vacuum cut valve by-pass valve harness connectors. (Scheme 45) Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. (Scheme 50) Apply.2-.4 psi (1.38-2.76 kPa) of pressure to EVAP service port. DO NOT exceed.6 psi (4.12 kPa) of pressure. Remove pressure pump from EVAP service port. Using Leak Detector (J41416), locate EVAP system leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to next step.
7. Remove water separator and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". (Scheme 51) Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
8. Check EVAP-CVCV, "O" ring and circuit. Perform «DTC CONFIRMATION TEST»(ref-135505-S32409333392002100700000) under DTC P1446: EVAP CANISTER VENT CONTROL VALVE. If 1st trip DTC is detected, repair as necessary. If 1st trip DTC is not detected, go to next step.
9. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 11. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 11.
10. Inspect EVAP canister for damage. Replace, if necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. If problem is not found, go to next step.
11. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
12. Disconnect EVAP-CPVCSV hose from EVAP service port. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Press "Qu" on CONSULT-II screen to increase PURG VOL CONT/V opening to 100 percent. Check for vacuum at disconnected hose while increasing engine speed to 2000 RPM. If vacuum exists, go to step 15. If vacuum does not exist, go to step 14.
13. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect EVAP-CPVCSV hose from EVAP service port. Start engine and let it idle for at least 80 seconds. While quickly increasing engine speed to 2000 RPM, check for vacuum at EVAP-CPVCSV hose. If vacuum exists, go to step 15. If vacuum does not exist, go to next step.
14. Check EVAP system vacuum hoses for blockages or leaks. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair as necessary. If problem is not found, go to next step.
15. If using CONSULT-II, go to next step. If using generic scan tool, go to step 17.
16. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 18. If operation is not as specified, go to next step.
17. Turn ignition off. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage to EVAP-CPVCSV terminals. (Scheme 48) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
18. On 2.5L, go to next step. On 3.5L, check absolute pressure sensor by performing «DTC CONFIRMATION TEST»(ref-135505-S31911281742002091600000) under DTC P0107 OR DTC P0108: ABSOLUTE PRESSURE SENSOR (3.5L). If 1st trip DTC is detected, replace ECM. If 1st trip DTC is not detected, go to next step.
19. Remove fuel pump assembly. Measure resistance between fuel pump assembly connector terminals No. "T" and "E", with FTT sensor submerged in heated water. (Scheme 31) Resistance should be within acceptable range shown in illustration. (Scheme 25) If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
20. Remove EVAP-CSPS with its harness connector connected. (Scheme 45) Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Voltage should be 3.2-4.8 volts (on 2.5L) or 3.0-3.6 volts (on 3.5L). On 2.5L, apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. On 3.5L, apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. On all models, if voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
21. Check EVAP purge line at fuel tank and EVAP canister for leaks or improper connection. See «VACUUM DIAGRAMS»(ref-135815) article. If a problem is found, repair as necessary. If purge line is okay, clean with compressed air, then go to next step.
22. Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness or improper connection. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair or replace hoses or tubes as necessary. If problem is not found, go to next step.
23. Check signal line and recirculation line between filler neck and fuel tank for clogging, kink, cracks, looseness and improper connection. If problem is found, repair or replace hoses, tubes or filler neck as necessary. If problem is not found, go to next step.
24. Check refueling control valve. See «FUEL EVAPORATION CONTROL SYSTEM»(ref-135812-S37782422942002022500000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If refueling control valve is okay, go to next step. If refueling control valve is not okay, replace fuel tank.
25. Measure resistance between fuel pump assembly terminals "G" and "E" as shown in illustration. (Scheme 52) If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor.
26. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 50

Scheme 51

Scheme 52

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for at least 13 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect EVAP-CPVCSV harness connector. (Scheme 46) Turn ignition on. Measure voltage between ground and EVAP-CPVCSV harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 44 (10-amp) located in Intelligent Power Distribution Module (IPDM). see scheme 10and see scheme 11. Check for poor connection at IPDM connector E124 terminal No. 19 (Red/Yellow wire). see scheme 12 Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 8A (Red/Yellow wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 2 (Red/Yellow wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14 Check for open or short between EVAP-CPVCSV and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Purple/Red wire between EVAP-CPVCSV harness connector terminal No. 2 and ECM harness connector terminal No. 13. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 6.
5. Reconnect all harness connectors. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 7. If operation is not as specified, go to next step.
6. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage between EVAP-CPVCSV terminals. (Scheme 48) Check for airflow between ports "A" and "B". Air should flow. Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Disconnect EVAP-CPVCSV harness connector. (Scheme 47) Turn ignition on. Measure voltage between ground and EVAP-CPVCSV harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check for poor connection at Intelligent Power Distribution Module (IPDM) connector E122 terminal No. 35 (Red wire). see scheme 12 Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 4B (Red wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 5 (Red wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 15 Check for poor connection at Green, 8-pin connector F44 terminal No. 4 (Red/Yellow wire). (Scheme 11) Connector F44 is located on top front of engine. see scheme 15 Check for open or short between EVAP-CPVCSV and IPDM. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Purple/Red wire between EVAP-CPVCSV harness connector terminal No. 2 and ECM harness connector terminal No. 10. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at Green, 8-pin connector F44 terminal No. 3 (Purple/Red wire). (Scheme 11) Connector F44 is located on top front of engine. see scheme 15 Check for open or short between EVAP-CPVCSV and ECM. Repair as necessary.
5. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 7.
6. Reconnect all harness connectors. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 8. If operation is not as specified, go to next step.
7. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage between EVAP-CPVCSV terminals. (Scheme 48) Check for airflow between ports "A" and "B". Air should flow. Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Note. Before proceeding, ensure battery voltage is more than 11 volts at idle.

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and wait at least 8 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Turn ignition off then on. Select VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. Press ON/OFF. EVAP-CVCV should click. For location (Scheme 45) If EVAP-CVCV clicks, go to step 7. If EVAP-CVCV does not click, go to next step.
3. Turn ignition off. Disconnect EVAP-CVCV harness connector. (Scheme 45) Turn ignition on. Measure voltage between ground and EVAP-CVCV harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 5. If battery voltage does not exist, go to next step.
4. Check the following: Check fuse No. 44 (10-amp) located in Intelligent Power Distribution Module (IPDM). see scheme 10and see scheme 11. Check for poor connection at IPDM connector E124 terminal No. 19 (Red/Yellow wire). see scheme 12 Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 8A (Red/Yellow wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 2 (Red/Yellow wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check for poor connection at White, 12-pin connector F55 terminal No. 2 (Red/Yellow wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open or short between EVAP-CVCV and fuse. Repair as necessary.
5. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Orange wire between EVAP-CVCV harness connector terminal No. 2 and ECM harness connector terminal No. 11 (on 2.5L) or No. 105 (on 3.5L). (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 7.
6. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 7 (Orange wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open or short between EVAP-CVCV and ECM. Repair as necessary.
7. Disconnect hose from EVAP-CVCV. Check hose for blockage. If blockage is found, clean with compressed air. If blockage is not found, go to next step.
8. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
9. If using CONSULT-II, go to next step. If using generic scan tool, go to step 11.
10. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 12. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
11. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 53

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Ensure FUEL T/TEMP SE is more than 32°F (0°C).
2. Start engine and wait at least 20 seconds. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S37410996982002092500000) . If 1st trip DTC is not detected, system is okay at this time.

1. Start engine and warm to normal operating temperature. Measure voltage between ground and fuel tank temperature sensor signal circuit at ECM terminal No. 70 (on 2.5L) or No. 75 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Ensure voltage is less than 4.2 volts.
2. Turn ignition off and wait at least 10 seconds. Start engine and wait at least 20 seconds. Select MODE 7 with scan tool. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S37410996982002092500000). If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19)or (Scheme 20). Disconnect EVAP-CSPS harness connector. (Scheme 45) Check connector for water. If water exists, repair or replace harness connector as necessary. If water does not exist, go to next step.
2. Turn ignition on. Measure voltage between ground and EVAP-CSPS harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to step 4. If voltage is not about 5 volts, go to next step.
3. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 6 (Red wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14or see scheme 15. Check for open or short between EVAP-CSPS and ECM. Repair as necessary.
4. Turn ignition off. Check continuity between engine ground and EVAP-CSPS harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 6.
5. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 10 (Black wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open between EVAP-CSPS, ECM and transmission control module (on A/T models). Repair as necessary.
6. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between EVAP-CSPS harness connector terminal No. 2 and ECM harness connector terminal No. 88 (on 2.5L) or No. 60 (on 3.5L). (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 8.
7. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 9 (White wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open or short between EVAP-CSPS and ECM. Repair as necessary.
8. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. Voltage should be 3.2-4.8 volts (on 2.5L) or 3.0-3.6 volts (on 3.5L). On 2.5L, apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. On 3.5L, apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. On all models, if voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Ensure FUEL T/TEMP SE is more than 32°F (0°C).
2. Start engine and wait at least 20 seconds. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S03555281272002092600000) . If 1st trip DTC is not detected, system is okay at this time.

1. Start engine and warm to normal operating temperature. Measure voltage between ground and fuel tank temperature sensor signal circuit at ECM terminal No. 70 (on 2.5L) or No. 75 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Ensure voltage is less than 4.2 volts.
2. Turn ignition off and wait at least 10 seconds. Start engine and wait at least 20 seconds. Select MODE 7 with scan tool. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S03555281272002092600000). If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19)or (Scheme 20). Disconnect EVAP-CSPS harness connector. (Scheme 45) Check connector for water. If water exists, repair or replace harness connector as necessary. If water does not exist, go to next step.
2. Turn ignition on. Measure voltage between ground and EVAP-CSPS harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to step 4. If voltage is not about 5 volts, go to next step.
3. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 6 (Red wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14or see scheme 15. Check for open or short between EVAP-CSPS and ECM. Repair as necessary.
4. Turn ignition off. Check continuity between engine ground and EVAP-CSPS harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 6.
5. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 10 (Black wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open between EVAP-CSPS, ECM and transmission control module (on A/T models). Repair as necessary.
6. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between EVAP-CSPS harness connector terminal No. 2 and ECM harness connector terminal No. 88 (on 2.5L) or No. 60 (on 3.5L). (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 8.
7. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 9 (White wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open or short between EVAP-CSPS and ECM. Repair as necessary.
8. Disconnect hose from EVAP-CVCV. Check hose for blockage. If blockage is found, clean with compressed air. If blockage is not found, go to next step.
9. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
10. If using CONSULT-II, go to next step. If using generic scan tool, go to step 12.
11. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 13. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
12. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
13. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. Voltage should be 3.2-4.8 volts (on 2.5L) or 3.0-3.6 volts (on 3.5L). On 2.5L, apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. On 3.5L, apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. On all models, if voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
14. Remove water separator, and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". (Scheme 51) Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
15. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 17. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 17.
16. Inspect EVAP canister for damage. Replace, if necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. If problem is not found, go to next step.
17. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Tighten fuel filler cap securely until ratcheting sound is heard. Turn ignition on. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select DATA MONITOR mode with CONSULT-II.
2. Ensure the following conditions are met: COOLAN TEMP/S: 32-158°F (0-70°C). INT/A TEMP SE: 32-140°F (0-60°C).
3. Select EVAP SML LEAK P0442/P1442 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT-II. Follow instructions displayed. NOTE: If engine speed cannot be maintained within range displayed on CONSULT-II screen, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.
4. If OK is displayed, system is okay at this time. If NG is displayed, press SELF-DIAG RESULTS. If EVAP GROSS LEAK [P0455] is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S09058878182002022200000) . If P0442 is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S32886501052002092400000) under DTC P0442: EVAP CONTROL SYSTEM.

1. Drive vehicle according to specified driving pattern to set System Readiness Test (SRT) codes. See «SYSTEM READINESS TEST»(ref-135505-S05390287112002022200000) under SELF-DIAGNOSTIC SYSTEM.
2. Select MODE 1 on scan tool and check SRT status of EVAP system. If EVAP system SRT is complete, system is okay at this time. If EVAP system SRT is incomplete, turn ignition off, wait at least 10 seconds and go to next step.
3. Perform driving pattern again. Stop vehicle and select MODE 3 on scan tool. If DTC P0455 is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S09058878182002022200000) . If DTC P0442 or DTC P1442 is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S32886501052002092400000) under DTC P0442: EVAP CONTROL SYSTEM. If P0441 is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S05976518902002092300000) under DTC P0441: EVAP CONTROL SYSTEM. If DTC P0441, DTC P0442, DTC P0455 or DTC P1442 is not displayed, go to next step.
4. Select MODE 1 on scan tool. If EVAP system SRT is complete, system is okay at this time. If EVAP system SRT is incomplete, go to step 2 .

1. Ensure fuel cap is original equipment. Attempt to turn fuel cap clockwise. If fuel cap was tightened properly, go to next step. If fuel cap was not tightened properly, clean fuel cap and filler neck with compressed air. Reinstall cap and tighten until ratcheting sound is heard.
2. While removing fuel cap, listen for air escaping from fuel tank. If air escaped from fuel tank, go to step 4. If air did not escape from fuel tank, go to next step.
3. Using a suitable hand vacuum/pressure pump with fuel cap adapter, apply pressure and vacuum to fuel cap. Fuel cap vacuum relief valve should open when pressure reaches 2.32-2.90 psi (16.0-20.0 kPa) and when vacuum reaches 98-1.78 in. Hg. If operation is as specified, go to next step. If operation is not as specified, replace fuel cap.
4. Check EVAP purge line (pipe, rubber tube, fuel tank and EVAP canister) for cracks, improper connection or disconnection. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair as necessary. If problem is not found, clean purge line (pipe and rubber tube) with compressed air, then go to next step.
5. Check EVAP-CVCV, "O" ring and circuit. See «DTC P1448: EVAP CANISTER VENT CONTROL VALVE»(ref-135505-S24025535932002100700000). If problem is found, repair as necessary. If problem is not found, go to next step.
6. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 46) Connect a suitable pressure pump to adapter. DO NOT use compressed air. If using CONSULT-II, go to next step. If using generic scan tool, go to step 8.
7. Turn ignition on. Select EVAP SYSTEM CLOSE of WORK SUPPORT mode with CONSULT-II. Press START. Observe pressure indicator on CONSULT-II. Apply pressure to EVAP system until pressure indicator reaches middle of bar graph. DO NOT exceed.6 psi (4.12 kPa) of pressure. Using Leak Detector (J41416), locate EVAP leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to step 9.
8. Turn ignition off. Disconnect EVAP-CVCV and vacuum cut valve by-pass valve harness connectors. (Scheme 45) Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. (Scheme 50) Apply.2-.4 psi (1.38-2.76 kPa) of pressure to EVAP service port. DO NOT exceed.6 psi (4.12 kPa) of pressure. Remove pressure pump from EVAP service port. Using Leak Detector (J41416), locate EVAP system leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to next step.
9. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 11.
10. Disconnect vacuum hose connected to EVAP-CPVCSV at EVAP service port. (Scheme 46) Connect vacuum gauge to disconnected hose. Start engine and let it idle. Select PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Increase engine speed to 2000 RPM. Press "Qd" and "Qu" on CONSULT-II screen to adjust PURG VOL CONT/V opening. When opening is 100 percent, vacuum should exist. When opening is zero percent, vacuum should not exist. If vacuum is as specified, go to step 14. If vacuum is not as specified, go to step 12.
11. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose connected to EVAP-CPVCSV at EVAP service port. (Scheme 46)or (Scheme 47). Connect vacuum gauge to disconnected hose. Start engine and let it idle for at least 80 seconds. Check for vacuum while increasing engine speed to 2000 RPM. Vacuum should exist. Release throttle and let engine idle. Vacuum should not exist. If vacuum is as specified, go to step 15. If vacuum is not as specified, go to next step.
12. Check vacuum hoses for clogging or disconnection. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair as necessary. If problem is not found, go to next step.
13. If using CONSULT-II, go to next step. If using generic scan tool, go to step 15.
14. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 16. If operation is not as specified, go to next step.
15. Turn ignition off. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage to EVAP-CPVCSV terminals. (Scheme 48) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
16. Remove fuel pump assembly. Access cover is located under rear seat. Measure resistance between fuel pump assembly connector terminals No. "T" and "E", with FTT sensor submerged in heated water. (Scheme 31) Resistance should be within acceptable range shown in illustration. (Scheme 25) If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
17. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 by backprobing. Voltage should be 3.2-4.8 volts. Apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
18. Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness or improper connection. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair or replace hoses or tubes as necessary. If problem is not found, go to next step.
19. Check signal line and recirculation line between filler neck and fuel tank for clogging, kink, cracks, looseness and improper connection. If problem is found, repair or replace hoses, tubes or filler neck as necessary. If problem is not found, go to next step.
20. Check refueling control valve. See «FUEL EVAPORATION CONTROL SYSTEM»(ref-135812-S37782422942002022500000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If refueling control valve is okay, go to next step. If refueling control valve is not okay, replace fuel tank.
21. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Note. If fuel filler cap was removed, fuel tank was filled/drained or any EVAP control system parts were removed, wait at least one hour before performing DTC confirmation test.

Note. Before proceeding, ensure battery voltage is more than 11 volts at idle.

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II.
2. Ensure the following conditions are met: FUEL LEVEL SE: 0.25-1.15 volts. COOLAN TEMP/S: 32-90°F (0-32°C). FUEL T/TMP SE: 32-95°F (0-35°C). INT A/TEMP SE: more than 32°F (0°C). If all conditions are met, go to next step. If all conditions are not met, turn ignition off, and allow vehicle to cool. Or, drain/refill fuel until FUEL LEVEL SE indicates 0.25-1.15 volts. Wait at least one hour, then go to step 1 .
3. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select EVP V/S LEAK P0456/P1456 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT- II. Follow instructions displayed. NOTE: If engine speed cannot be maintained within range displayed on CONSULT-II screen, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.
4. If OK is displayed on CONSULT-II, system is okay at this time. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S18427206952002092700000) .

Note. Use the following test to check overall function of EVAP very small leak function. During this test, DTC may not be confirmed.

1. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 46)or (Scheme 47). Connect a suitable pressure pump with hose and gauge to adapter.
2. Turn ignition on. Using scan tool, select MODE 8 to close EVAP-CVCV and open vacuum cut valve bypass valve. Apply.39 psi (2.7 kPa) to EVAP system.
3. Observe gauge for 60 seconds. If pressure drops more than.06 psi (.4 kPa), go to «DIAGNOSTIC PROCEDURE»(ref-135505-S18427206952002092700000). If pressure does not drop more than.06 psi (.4 kPa), system is okay at this time.

1. Ensure fuel cap is original equipment. Attempt to turn fuel cap clockwise. If fuel cap was tightened properly, go to next step. If fuel cap was not tightened properly, clean fuel cap and filler neck with compressed air. Reinstall cap and tighten until ratcheting sound is heard.
2. While removing fuel cap, listen for air escaping from fuel tank. If air escaped from fuel tank, go to step 4. If air did not escape from fuel tank, go to next step.
3. Using a suitable hand vacuum/pressure pump with Fuel Filler Cap Adapter (MLR-8382), apply pressure and vacuum to fuel cap. Fuel cap vacuum relief valve should open when pressure reaches 2.22-2.90 psi (15.3-20.0 kPa) and when vacuum reaches.98-1.78 in. Hg (3.3-6.0 kPa). If operation is as specified, go to next step. If operation is not as specified, replace fuel cap.
4. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 46)or (Scheme 47). Connect a suitable pressure pump to adapter. DO NOT use compressed air. If using CONSULT-II, go to next step. If using generic scan tool, go to step 6.
5. Turn ignition on. Select EVAP SYSTEM CLOSE of WORK SUPPORT mode with CONSULT-II. Press START. Observe pressure indicator on CONSULT-II. Apply pressure to EVAP system until pressure indicator reaches middle of bar graph. DO NOT exceed.6 psi (4.12 kPa) of pressure. Using Leak Detector (J41416), locate EVAP leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to step 7.
6. Turn ignition off. Disconnect EVAP-CVCV and vacuum cut valve by-pass valve harness connectors. (Scheme 45) Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. (Scheme 50) Apply.2-.4 psi (1.38-2.76 kPa) of pressure to EVAP service port. DO NOT exceed.6 psi (4.12 kPa) of pressure. Remove pressure pump from EVAP service port. Using Leak Detector (J41416), locate EVAP system leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to next step.
7. Remove water separator and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". (Scheme 51) Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
8. Check EVAP-CVCV, "O" ring and circuit. See «DTC P1448: EVAP CANISTER VENT CONTROL VALVE»(ref-135505-S24025535932002100700000). If problem is found, repair as necessary. If problem is not found, go to next step.
9. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 11. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 11.
10. Inspect EVAP canister for damage. Replace, if necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. If problem is not found, go to next step.
11. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
12. Disconnect EVAP-CPVCSV hose from EVAP service port. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Press Qu on CONSULT-II screen to increase PURG VOL CONT/V opening to 100 percent. Check for vacuum at disconnected hose while increasing engine speed to 2000 RPM. If vacuum exists, go to step 16. If vacuum does not exist, go to step 14.
13. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect EVAP-CPVCSV hose from EVAP service port. Start engine and let it idle for at least 80 seconds. While quickly increasing engine speed to 2000 RPM, check for vacuum at EVAP-CPVCSV hose. If vacuum exists, go to step 17. If vacuum does not exist, go to next step.
14. Check vacuum hoses for clogging or disconnection. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair as necessary. If problem is not found, go to next step.
15. If using CONSULT-II, go to next step. If using generic scan tool, go to step 17.
16. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 18. If operation is not as specified, go to next step.
17. Turn ignition off. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage to EVAP-CPVCSV terminals. (Scheme 48) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
18. On 2.5L, go to next step. On 3.5L, check absolute pressure sensor by performing «DTC CONFIRMATION TEST»(ref-135505-S31911281742002091600000) under DTC P0107 OR P0108: ABSOLUTE PRESSURE SENSOR (3.5L). If 1st trip DTC is detected, replace ECM. If 1st trip DTC is not detected, go to next step.
19. Remove fuel pump assembly. Access cover is located under rear seat. Measure resistance between fuel pump assembly connector terminals No. "T" and "E", with FTT sensor submerged in heated water. (Scheme 31) Resistance should be within acceptable range shown in illustration. (Scheme 25) If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
20. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. Voltage should be 3.2-4.8 volts (on 2.5L) or 3.0-3.6 volts (on 3.5L). On 2.5L, apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. On 3.5L, apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. On all models, if voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
21. Check EVAP purge line at fuel tank and EVAP canister for leaks or improper connection. See «VACUUM DIAGRAMS»(ref-135815) article. If a problem is found, repair as necessary. If problem is not found, clean purge line with compressed air, then go to next step.
22. Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness or improper connection. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair or replace hoses or tubes as necessary. If problem is not found, go to next step.
23. Check signal line and recirculation line between filler neck and fuel tank for clogging, kink, cracks, looseness and improper connection. If problem is found, repair or replace hoses, rubes or filler neck as necessary. If problem is not found, go to next step.
24. Check refueling control valve. See «FUEL EVAPORATION CONTROL SYSTEM»(ref-135812-S37782422942002022500000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If refueling control valve is okay, go to next step. If refueling control valve is not okay, replace fuel tank.
25. Measure resistance between fuel pump assembly terminals "G" and "E" as shown in illustration. (Scheme 52) If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor.
26. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and wait a maximum of 2 minutes. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Disconnect fuel pump assembly harness connector. Access cover is located under rear seat. Measure voltage between ground and fuel pump assembly harness connector terminal "G" (Green/Black wire). (Scheme 28) If voltage is about 5 volts, go to step 3. If voltage is not about 5 volts, go to next step.
2. Check the following: Check for poor connection at White, 16-pin connector M12 terminal No. 8 (Green/Black wire). (Scheme 29) Connector M12 is located under left side of instrument panel. see scheme 16 Check for open or short between fuel pump assembly and instrument cluster. Repair as necessary.
3. Turn ignition off. Check continuity between body ground and fuel pump assembly harness connector terminal "E" (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at White, 16-pin connector M12 terminal No. 2 (Black wire). (Scheme 29) Connector M12 is located under left side of instrument panel. see scheme 16 Check for open or short between fuel pump assembly and body ground. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of the following: Green/Black wire between fuel pump assembly harness connector terminal "G" and ECM harness connector terminal No. 87 (on 2.5L) or No. 69 (on 3.5L). Between fuel pump assembly harness connector terminal "E" (Black wire) and Black/Red wire at ECM harness connector terminal No. 77 (on 2.5L) or No. 78 (on 3.5L). (Scheme 12) Also, check circuits for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 7.
6. Check the following: Check for poor connection at White, 16-pin connector M12 terminals No. 2 (Black wire) and No. 8 (Green/Black wire). (Scheme 29) Connector M12 is located under left side of instrument panel. see scheme 16 Check for poor connection at White, 24-pin connector F59 terminals No. 16 (Black/Red wire) and No. 18 (Green/Black wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check for open or short between fuel pump assembly and body ground. Repair as necessary.
7. Remove fuel pump assembly. Measure resistance between fuel pump assembly terminals "G" and "E" as shown in illustration. (Scheme 52) If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Note. Use the following test to check overall function of fuel level sensor circuit. During this test, 1st trip DTC may not be confirmed.

1. Release fuel system pressure. See «FUEL SYSTEM»(ref-135504-S17351378512002022200000) in BASIC DIAGNOSTIC PROCEDURES article. Remove fuel feed hose from fuel level sensor unit located behind access cover, under rear seat.
2. Connect a fuel hose to fuel level sensor unit. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select FUEL LEVEL SE in DATA MONITOR mode with CONSULT-II. Check FUEL LEVEL SE output voltage and note it.
3. Select FUEL PUMP in ACTIVE TEST mode with CONSULT-II. Press ON and drain about 7.93 Gals. (30 L) of fuel, then press OFF. Fill tank with drained fuel.
4. Check FUEL LEVEL SE output voltage. Voltage should change more than 0.03V during draining and refilling. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S06170471992002093000000) . If voltage is as specified, system is okay at this time.

Note. Use the following test to check overall function of fuel level sensor circuit. During this test, 1st trip DTC may not be confirmed.

1. To check overall function of fuel level sensor circuit, release fuel system pressure. See «FUEL SYSTEM»(ref-135504-S17351378512002022200000) in BASIC DIAGNOSTIC PROCEDURES article. Remove fuel feed hose from fuel level sensor unit located behind access cover, under rear seat.
2. Connect a fuel hose to fuel level sensor unit. Place other end of hose into a suitable fuel container. Turn ignition off. Set voltmeter probes between ground and fuel level sensor signal circuit (Green/Black wire) at ECM terminal No. 87 (on 2.5L) or No. 69 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Turn ignition on and monitor voltmeter.
3. Using suitable equipment, drain 7.93 Gals. (30.0 L) of fuel from tank. Refill tank with drained fuel. Voltage should change more than.03 volt during draining and refilling. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S06170471992002093000000). If voltage is as specified, system is okay at this time.

Perform step 7 under DIAGNOSTIC PROCEDURE under DTC P0460: FUEL LEVEL SENSOR.

Turn ignition on. Select DATA MONITOR mode with scan tool. Wait at least 5 seconds. If first trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

See DIAGNOSTIC PROCEDURE under DTC P0460: FUEL LEVEL SENSOR FUNCTION.

1. Start engine. Ensure TCS switch is in OFF position. Read VHCL SPEED SE in DATA MONITOR mode with CONSULT-II. VHCL SPEED SE should be able to exceed 6 MPH when drive wheels are rotating at 6 MPH or more. If operation is as specified, go to next step. If operation is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S30046830702002093000000) .
2. Select DATA MONITOR mode with CONSULT-II. Warm engine to normal operating temperature. Maintain the following conditions for at least 10 consecutive seconds. 2.5L: ENG SPEED: 1200-6000 RPM. COOLAN TEMP/S: more than 158°F (70°C). B/FUEL SCHDL: 6.0-31.8 msec. PW/ST SIGNAL: OFF. 3.5L: ENG SPEED: more then 1700 RPM (on A/T models) or 1800 RPM (on M/T models). COOLAN TEMP/S: more than 158°F (70°C). B/FUEL SCHDL: more than 5.5 msec. PW/ST SIGNAL: OFF. Transmission: except Park or Neutral.
3. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S30046830702002093000000) . If 1st trip DTC is not detected, system is okay at this time.

Note. Use the following test to check overall function of VSS circuit. During this test, 1st trip DTC may not be confirmed.

Raise drive wheels. Start engine. Select MODE 1 with scan tool. VSS reading on scan tool should be able to exceed 6 MPH when drive wheels are rotating. If operation is not as specified, go to DIAGNOSTIC PROCEDURE . If operation is as specified, system is okay at this time.

Check VSS, VSS circuit and instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Repair as necessary.

1. Open hood. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select DATA MONITOR mode with scan tool.
2. Start engine let it idle for at least one minute. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S23785576752002093000000) . If 1st trip DTC is not detected, system is okay at this time.

Ensure PCV hose is installed correctly. Start engine and let it idle. Check for air intake leak after mass airflow sensor. If leak is found, repair as necessary. If no leak is found, replace ECM.

Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine and let it idle for at least 5 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect PSP sensor harness connector. (Scheme 54) Turn ignition on. Measure voltage between ground and PSP sensor harness connector terminal No. 3 (Red wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between PSP sensor and ECM.
2. Turn ignition off. Check continuity between engine ground and PSP sensor harness connector terminal No. 1 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 4.
3. Check the following: Check Blue, 12-pin joint connector No. 5 (connector F52). (Scheme 24) Connector F52 is located near ECM. see scheme 15 Check for open or short between PSP sensor, ECM and transmission control module (on A/T models). Repair as necessary.
4. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between PSP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 89. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Reconnect all harness connectors. Start engine and let it idle. Measure voltage between ground and ECM terminal No. 89 (White wire) by backprobing. When steering wheel is fully turned, voltage should be about 3.6 volts. When steering wheel is not fully turned, voltage should be about 0.6 volt. If voltage is as specified, go to next step. If voltage is not as specified, replace PSP sensor.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 54

Note. Perform the following DTC confirmation tests in order. If a DTC confirmation test has been previously performed, turn ignition off and wait at least 10 seconds before performing next DTC confirmation test.

Turn ignition on. Select DATA MONITOR mode with scan tool. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to DTC CONFIRMATION TEST "B" .

DTC Confirmation Test "B"

1. Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool. Turn ignition off and wait at least 10 seconds. Turn ignition on.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S28248453412002093000000) . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to «DTC CONFIRMATION TEST "C"»(ref-135505-S17727106862002093000000) .

DTC Confirmation Test "C"

1. Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool.
2. Turn ignition off and wait at least 10 seconds. Turn ignition on.
3. Repeat step 2 , 32 times.
4. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S28248453412002093000000) . If 1st trip DTC is not detected, system is okay at this time.

1. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3 .
2. Turn ignition on. Select SELF-DIAG RESULTS mode with CONSULT-II. Press ERASE. Perform «DTC CONFIRMATION TEST "A"»(ref-135505-S24127495612002093000000) again. If 1st trip DTC is detected, replace ECM. If 1st trip DTC is not detected, test is complete.
3. Turn ignition on. Select MODE 4 with scan tool. Press ERASE. Perform «DTC CONFIRMATION TEST "A"»(ref-135505-S24127495612002093000000) again. If 1st trip DTC is detected, replace ECM. If 1st trip DTC is not detected, test is complete.

Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool. Start engine and let it idle for one second. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect instrument cluster connector M24. see scheme 16 Turn ignition on. Measure voltage between ground and instrument cluster harness connector terminals No. 17 and 18 (both Gray wires). (Scheme 55) If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 14 (10-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector M4 terminal 5P (Gray wire). see scheme 9 Check for open or short fuse block and instrument cluster. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Light Green/Black wire between instrument cluster harness connector terminal No. 23 and ECM harness connector terminal No. 18 (on 2.5L) or No. 33 (on 3.5L). (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at White, 24-pin connector F59 terminal No. 7 (Light Green/Black wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check for open or short between instrument cluster and ECM. Repair as necessary.
5. Check continuity between instrument cluster terminals (component side) as shown in illustration. (Scheme 56) If continuity is as specified, go to next step. If continuity is not as specified, replace instrument cluster.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 55

Scheme 56

1. Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool.
2. Start engine and let it idle for one second. Turn ignition off and wait at least 10 seconds. Turn ignition on.
3. Repeat step 2 four times. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S36376875202002093000000) . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Measure voltage between ground and White/Blue wire at ECM harness connector terminal No. 66 (on 2.5L) or No. 67 (on 3.5L). (Scheme 12) If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 24 (10-amp) located in fuse and fusible link box on left side of engine compartment. Check for poor connection at Black, 8-pin connector F32 terminal No. 6 (White/Blue wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check for open or short between ECM and fuse. Repair as necessary.
3. Check for intermittent condition. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Reconnect all harness connectors. If using CONSULT-II, go to next step. If using generic scan tool, go to step 6.
5. Turn ignition on. Select SELF-DIAG RESULTS mode with CONSULT-II. Press ERASE. Perform «DTC CONFIRMATION TEST»(ref-135505-S10729346222002093000000). If 1st trip DTC P1065 is detected again, replace ECM. If 1st trip DTC P1065 is not detected, test is complete.
6. Turn ignition on. Using scan tool, select MODE 4 and clear DTCs. Perform «DTC CONFIRMATION TEST»(ref-135505-S10729346222002093000000). If 1st trip DTC P1065 is detected again, replace ECM. If 1st trip DTC P1065 is not detected, test is complete.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and wait 5 seconds at most. If DTC is detected, go to DIAGNOSTIC PROCEDURE . If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19)or (Scheme 20). Disconnect MAF sensor harness connector. (Scheme 21)or (Scheme 22). Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminals No. 2 (Red wire) and No. 4 (Red/Green wire). (Scheme 23) About 5 volts should exist at terminal No. 2, and battery voltage should exist at terminal No. 4. If voltage is as specified, go to step 3. If voltage is not as specified, go to next step.
2. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 6B (Red/Green wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 4 (Red/Green wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14or see scheme 15. Check for open or short between MAF sensor and ECM relay. Check for open or short between MAF sensor and ECM. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Black wire between MAF sensor harness connector terminal No. 3 and ECM harness connector terminal No. 80. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Check continuity of White wire between MAF sensor harness connector terminal No. 1 and ECM harness connector terminal No. 72 (on 2.5L) or No. 62 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 72 (on 2.5L) or No. 62 (on 3.5L) by backprobing, with engine at specified speeds. See appropriate MASS AIRFLOW SENSOR VOLTAGE table under DIAGNOSTIC PROCEDURE under DTC P0101: MASS AIRFLOW SENSOR. If voltage is as specified, go to step 7. If voltage is not as specified, go to next step.
6. Turn ignition off. Disconnect and reconnect MAF sensor harness connector. Repeat step 5. If voltage is still not as specified, remove MAF sensor. Check hot film for damage or dust. If problem is found, clean or replace MAF sensor as necessary. If problem is not found, go to next step.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for at least 5 seconds.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S24683170822002100100000) . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect IVTC solenoid valve harness connector. (Scheme 57) Turn ignition on. Measure voltage between ground and IVTC solenoid valve harness connector terminal No. 2 (Red wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 8A (Red wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 5 (Red wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14 Check for open or short between IVTC solenoid valve and ECM. Check for open or short between IVTC solenoid valve and intelligent power distribution module. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Green wire between IVTC solenoid valve harness connector terminal No. 1 and ECM harness connector terminal No. 107. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Measure resistance between IVTC solenoid valve terminals. Resistance should about 8 ohms at 68°F (20°C). Also, check continuity between ground and each terminal. Continuity should not exist. Replace IVTC solenoid, if resistance or continuity is not as specified. If IVTC solenoid test valve tests okay, go to next step.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 57

DTC Confirmation Test "A" & "B"

1. Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool. Shift transmission into Drive (A/T) or first gear (M/T), and wait at least 2 seconds. Turn ignition off and wait at least 10 seconds.
2. Turn ignition on. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S09462057142002100100000) . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to «DTC CONFIRMATION TEST "C"»(ref-135505-S42476770032002100100000) .

1. Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool. Shift transmission into Drive (A/T) or first gear (M/T), and wait at least 2 seconds. Shift transmission into Park or Neutral.
2. Start engine and let it idle for 3 seconds. If DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S09462057142002100100000) . If DTC is not detected, system is okay at this time.

1. Remove air intake duct. Check for foreign matter between throttle valve and bore. If foreign matter is not found, go to next step. If foreign matter is found, remove foreign matter, and clean inside of electric throttle control actuator.
2. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000) .

Turn ignition on and wait at least 2 seconds. Select DATA MONITOR mode with scan tool. Start engine and let it idle for 5 seconds. If DTC is detected, go to DIAGNOSTIC PROCEDURE . If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19)or (Scheme 20). Disconnect ECM harness connector. see scheme 5 Check continuity between engine ground and Black wire at ECM harness connector terminal No. 115 (on 2.5L) or No. 107 (on 3.5L). (Scheme 12) Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
2. Reconnect ECM harness connector. Measure voltage between ground and Red wire at ECM terminal No. 113 (on 2.5L) or No. 102 (on 3.5L) by backprobing. Voltage should be about zero volts. Turn ignition on. Battery voltage should exist. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
3. Turn ignition off. Disconnect ECM harness connector. Disconnect Intelligent Power Distribution Module (IPDM) harness connector E122. see scheme 10and see scheme 12. Check continuity of Red wire between IPDM harness connector E122 terminal No. 36 and ECM harness connector terminal No. 113 (on 2.5L) or No. 102 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 2B (Red wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 7 (Red wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check for open or short between ECM and IPDM. Repair as necessary.
5. Reconnect all harness connectors. Measure voltage between ground and Orange wire at ECM terminal No. 112 (on 2.5L) or No. 26 (on 3.5L). If battery voltage exists, go to step 9. If battery voltage does not exist, go to next step.
6. Turn ignition off. Disconnect ECM harness connector. Disconnect Intelligent Power Distribution Module (IPDM) harness connector E122. Check continuity of Orange wire between IPDM harness connector E122 terminal No. 40 and ECM harness connector terminal No. 112 (on 2.5L) or No. 26 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 8.
7. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 16A (Orange wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Gray, 9-pin connector F33 terminal No. 2 (Orange wire). (Scheme 58) Connector F33 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check for open or short between ECM and IPDM. Repair as necessary.
8. Check fuse No. 37 (15-amp) located in IPDM. If fuse is okay, go to next step. If fuse is not okay, replace fuse.
9. Check for intermittent condition. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, replace IPDM.
10. Turn ignition off. Disconnect electric throttle control actuator harness connector. (Scheme 32)or (Scheme 34). Disconnect ECM harness connector. Check continuity of Yellow wire between electric throttle control actuator harness connector terminal No. 6 and ECM harness connector terminal No. 114 (on 2.5L) or No. 101 (on 3.5L), and Brown wire between electric throttle control actuator harness connector terminal No. 3 and ECM harness connector terminal No. 116 (on 2.5L) or No. 103 (on 3.5L). (Scheme 33) Also, check circuits for short to ground, short to voltage or short together. If problem is found, repair as necessary. If problem is not found, go to next step.
11. Remove air intake duct. Check for foreign matter between throttle valve and throttle housing. If foreign matter is found, remove foreign matter, and clean throttle housing. If foreign matter is not found, go to next step.
12. Measure resistance between electric throttle control actuator terminals No. 3 and 6. (Scheme 59) Resistance should be 1-15 ohms at 77°F (25°C). If resistance is as specified, go to next step. If resistance is not as specified, replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000).
13. Check for intermittent condition. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, go to next step.
14. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000).

Scheme 58

Scheme 59

DTC Confirmation Test (DTC P1124)

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

DTC Confirmation Test (DTC P1126)

Turn ignition on and wait at least 2 seconds. Select DATA MONITOR mode with scan tool. Start engine and let it idle for 5 seconds. If DTC is detected, go to DIAGNOSTIC PROCEDURE . If DTC is not detected, system is okay at this time.

1. Turn ignition off. Measure voltage between ground and Orange wire at ECM terminal No. 112 (on 2.5L) or No. 26 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). If battery voltage exists, go to step 5. If battery voltage does not exist, go to next step.
2. Disconnect ECM harness connector. Disconnect Intelligent Power Distribution Module (IPDM) harness connector E122. see scheme 10and see scheme 12. Check continuity of Orange wire between IPDM harness connector E122 terminal No. 40 and ECM harness connector terminal No. 112 (on 2.5L) or No. 26 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 4.
3. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 16A (Orange wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Gray, 9-pin connector F33 terminal No. 2 (Orange wire). (Scheme 58) Connector F33 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check for open or short between ECM and IPDM. Repair as necessary.
4. Check fuse No. 37 (15-amp) located in IPDM. If fuse is okay, go to step 8. If fuse is not okay, replace fuse.
5. Reconnect all harness connectors. Measure voltage between ground and Red wire at ECM terminal No. 113 (on 2.5L) or No. 102 (on 3.5L) by backprobing. Voltage should be about zero volts. Turn ignition on. Battery voltage should exist. If voltage is as specified, go to step 8. If voltage is not as specified, go to next step.
6. Turn ignition off. Disconnect ECM harness connector. Disconnect Intelligent Power Distribution Module (IPDM) harness connector E122. see scheme 10and see scheme 12. Check continuity of Red wire between IPDM harness connector E122 terminal No. 36 and ECM harness connector terminal No. 113 (on 2.5L) or No. 102 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 8.
7. Check the following: Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 2B (Red wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 7 (Red wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check for open or short between ECM and IPDM. Repair as necessary.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on and wait at least 2 seconds. Select DATA MONITOR mode with scan tool. Start engine and let it idle for 5 seconds. If DTC is detected, go to DIAGNOSTIC PROCEDURE . If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19)or (Scheme 20). Disconnect ECM harness connector. see scheme 5 Disconnect electric throttle control actuator harness connector. (Scheme 32)or (Scheme 34). Go to next step.
2. Check continuity of Yellow wire between electric throttle control actuator harness connector terminal No. 6 and ECM harness connector terminal No. 114 (on 2.5L) or No. 101 (on 3.5L), and Brown wire between electric throttle control actuator harness connector terminal No. 3 and ECM harness connector terminal No. 116 (on 2.5L) or No. 103 (on 3.5L). (Scheme 33) Also, check circuits for short to ground, short to voltage or short together. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Measure resistance between electric throttle control actuator terminals No. 3 and 6. (Scheme 59) Resistance should be 1-15 ohms at 77°F (25°C). If resistance is as specified, go to next step. If resistance is not as specified, go to step 6.
4. On 3.5L, go to next step. On 2.5L, check the following: Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14or see scheme 15. Check continuity between ground and connector F51 terminal No. 2 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. On all models, check for intermittent condition. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000).

1. Start engine and warm to normal operating temperature.
2. Stop engine and wait at least 10 seconds.
3. Turn ignition on and select HO2S1 (B1) P1143 or HO2S1 (B2) P1163 of HO2S1 in DTC WORK SUPPORT mode with CONSULT-II.
4. Touch START on CONSULT-II screen.
5. Start engine and let it idle for at least 3 minutes. NOTE: Never raise engine speed above 3600 RPM after this step. If the engine speed limit is exceeded, return to step 5 .
6. When the following conditions are met, TESTING will be displayed on CONSULT-II screen. Maintain these conditions continuously until TESTING changes to COMPLETED (it will take 50 seconds or more). 2.5L: ENG SPEED: 1200-3200 RPM. Vehicle speed: less than 62 MPH. B/FUEL SCHDL: 1.9-13.0 msec. 3.5L: ENG SPEED: 1200-2600 RPM. Vehicle speed: less than 62 MPH. B/FUEL SCHDL: 2.5-12.0 msec. If TESTING is not displayed after 5 minutes, retry from step 2 .
7. Press SELF-DIAG RESULTS. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If OK is displayed, system is okay at this time.

Note. Use the following test to check overall function of front HO2S circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine and warm to normal operating temperature. On 2.5L, measure voltage between ground and ECM terminal No. 92 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing.
2. On all models, while observing voltmeter, increase engine speed to 2000 RPM. The following conditions should exist: Maximum voltage should be more than.6 volt at least once. Minimum voltage should be more than.1 volt at least once. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE. If voltage is as specified, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Loosen and retighten HO2S1 to 30-37 ft. lbs. (40-50 N.m). (Scheme 13) Go to next step.
2. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
3. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or P0172 is not detected and engine is not difficult to start, go to step 5.
4. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to next step.
5. Turn ignition off. Disconnect HO2S1 harness connector. Measure resistance between HO2S1 terminals No. 2 and 3. (Scheme 15) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S1 terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S1 terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S1 tests as specified, go to next step. If HO2S1 does not test as specified, replace HO2S1.
6. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 8.
7. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1) and HO2S1 MNTR (B1). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1) voltage goes above 0.6V at least once. HO2S1 (B1) voltage goes below 0.3V at least once. HO2S1 (B1) voltage never exceeds 1.0V. If operation is as specified, go to step 9. If operation is not as specified, replace HO2S1.
8. Measure voltage between ground and ECM terminal No. 92 by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Loosen and retighten appropriate HO2S1 to 30-44 ft. lbs. (40-60 N.m). (Scheme 16) Go to next step.
2. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
3. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step 5.
4. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 22) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to next step.
5. Turn ignition off. Disconnect appropriate HO2S1 harness connector. Measure resistance between HO2S1 outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between center terminal and each outer terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S1.
6. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 8.
7. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1)/(B2) and HO2S1 MNTR (B1)/(B2). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1)/(B2) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1)/(B2) voltage goes above 0.6V at least once. HO2S1 (B1)/(B2) voltage goes below 0.3V at least once. HO2S1 (B1)/(B2) voltage never exceeds 1.0V. If operation is as specified, go to step 9. If operation is not as specified, replace HO2S1.
8. Measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature.
2. Stop engine and wait at least 5 seconds.
3. Turn ignition on and select HO2S1 (B1) P1144 or HO2S1 (B2) P1164 of HO2S1 in DTC WORK SUPPORT mode with CONSULT-II.
4. Touch START on CONSULT-II screen.
5. Start engine and let it idle for at least 3 minutes. NOTE: Never raise engine speed above 3600 RPM after this step. If the engine speed limit is exceeded, return to step 5 .
6. When the following conditions are met, TESTING will be displayed on CONSULT-II screen. Maintain these conditions continuously until TESTING changes to COMPLETED (it will take 50 seconds or more). 2.5L: ENG SPEED: 1200-3200 RPM. Vehicle speed: less than 62 MPH. B/FUEL SCHDL: 1.9-13.0 msec. 3.5L: ENG SPEED: 1200-2600 RPM. Vehicle speed: less than 62 MPH. B/FUEL SCHDL: 2.5-12.0 msec. If TESTING is not displayed after 5 minutes, retry from step 2 .
7. Press SELF-DIAG RESULTS. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If OK is displayed, system is okay at this time.

Note. Use the following test to check overall function of front HO2S circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine and warm to normal operating temperature. On 2.5L, measure voltage between ground and ECM terminal No. 92 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing.
2. On all models, while observing voltmeter, increase engine speed to 2000 RPM. The following conditions should exist: Maximum voltage should be less than.8 volt at least once. Minimum voltage should be less than.35 volt at least once. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE. If voltage is as specified, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Loosen and retighten HO2S1 to 30-37 ft. lbs. (40-50 N.m). (Scheme 13) Go to next step.
2. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
3. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to step 5.
4. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to next step.
5. Turn ignition off. Disconnect HO2S1 harness connector. Check connectors for water. If water exists, repair or replace harness or connectors as necessary. If water does not exist, go to next step.
6. Measure resistance between HO2S1 terminals No. 2 and 3. (Scheme 15) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S1 terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S1 terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S1 tests as specified, go to next step. If HO2S1 does not test as specified, replace HO2S1.
7. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 9.
8. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1) and HO2S1 MNTR (B1). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1) voltage goes above 0.6V at least once. HO2S1 (B1) voltage goes below 0.3V at least once. HO2S1 (B1) voltage never exceeds 1.0V. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S1.
9. Measure voltage between ground and ECM terminal No. 92 by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Loosen and retighten appropriate HO2S1 to 30-44 ft. lbs. (40-60 N.m). (Scheme 16) Go to next step.
2. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
3. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step 5.
4. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 22) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to next step.
5. Turn ignition off. Disconnect appropriate HO2S1 harness connector. Check connectors for water. If water exists, repair or replace harness or connectors as necessary. If water does not exist, go to next step.
6. Measure resistance between appropriate HO2S1 outer terminals. Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between center terminal and each outer terminal. Continuity should not exist. If resistance and continuity are as specified, go to next step. If resistance or continuity is not as specified, replace HO2S1.
7. Reconnect all harness connectors. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 9.
8. Select MANU TRIG, and adjust TRIGGER POINT to 100% in DATA MONITOR mode with CONSULT-II. Select HO2S1 MNTR (B1)/(B2) and HO2S1 MNTR (B1)/(B2). Hold engine speed at 2000 RPM. Press RECORD. The following should occur: HO2S1 MNTR (B1)/(B2) changes from RICH to LEAN to RICH 5 times in 10 seconds. HO2S1 (B1)/(B2) voltage goes above 0.6V at least once. HO2S1 (B1)/(B2) voltage goes below 0.3V at least once. HO2S1 (B1)/(B2) voltage never exceeds 1.0V. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S1.
9. Measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle from less than.3 volt to more than.6 volt and back more than 5 times within 10 seconds. Maximum voltage should be more than.6 volt at least once. Minimum voltage should be less than.3 volt at least once. Voltage should never exceed one volt. If operation is as specified, go to next step. If operation is not as specified, replace HO2S1.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Open hood. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Ensure COOLAN TEMP/S indicates more than 158°F (70°C).
3. Select HO2S2 (B1) P1146 or HO2S2 (B2) P1166 of HO2S2 in DTC WORK SUPPORT mode with CONSULT-II.
4. Start engine. Follow instructions on CONSULT-II screen. Press SELF-DIAG RESULTS.
5. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If OK is displayed, system is okay at this time. If CANNOT BE DIAGNOSED is displayed, perform the following: Stop engine and allow to cool until COOLAN TEMP/S indicates less than 158°F (70°C). Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. When COOLAN TEMP/S reaches 158°F (70°C), return to step 3 .

Note. Use the following test to check overall function of HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running.
2. On 2.5L, measure voltage between ground and ECM terminal No. 95 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing.
3. On all models, while observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be less than.48 volt at least once during this procedure.
4. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to next step.
5. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to next step.
4. Disconnect HO2S2 harness connector. (Scheme 13) Check continuity between engine ground and HO2S2 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 95. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 8.
7. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1) voltage should be less than.48 volt at least once. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S2.
8. Measure voltage between ground and ECM terminal No. 95 by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 22) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to next step.
4. Disconnect appropriate HO2S2 harness connector. (Scheme 17) Check continuity between engine ground and HO2S2 harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 88. (Scheme 12) On bank 2, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 90. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 8.
7. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1)/(B2) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1)/(B2) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1)/(B2) voltage should be less than.48 volt at least once. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S2.
8. Measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Open hood. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Ensure COOLAN TEMP/S indicates more than 158°F (70°C).
3. Select HO2S2 (B1) P1147 or HO2S2 (B2) P1167 of HO2S2 in DTC WORK SUPPORT mode with CONSULT-II.
4. Start engine. Follow instructions on CONSULT-II screen. Press SELF-DIAG RESULTS.
5. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE. If OK is displayed, system is okay at this time. If CANNOT BE DIAGNOSED is displayed, perform the following: Stop engine and allow to cool until COOLAN TEMP/S indicates less than 158°F (70°C). Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. When COOLAN TEMP/S reaches 158°F (70°C), return to step 3 .

Note. Use the following test to check overall function of HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.

1. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running.
2. On 2.5L, measure voltage between ground and ECM terminal No. 95 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing.
3. On all models, while observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once during this procedure.
4. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to next step.
5. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to appropriate DIAGNOSTIC PROCEDURE.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 21) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or DTC P0172 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or DTC P0172. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171 or DTC P0172 is not detected and engine is not difficult to start, go to next step.
4. Disconnect HO2S2 harness connector. (Scheme 13) Check continuity between engine ground and HO2S2 harness connector terminal No. 4 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White wire between HO2S2 harness connector terminal No. 1 and ECM harness connector terminal No. 95. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 8.
7. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1) voltage should be less than.48 volt at least once. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S2.
8. Measure voltage between ground and ECM terminal No. 95 by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Let engine idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 22) Start engine and let it idle for at least 5 seconds. Turn ignition off. Reconnect MAF sensor. Ensure DTC P0102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, DTC P0172, DTC P0174 or DTC P0175. See «DTC P0171, DTC P0172, DTC P0174 OR DTC P0175: FUEL INJECTION SYSTEM FUNCTION»(ref-135505-S00229657722002022200000). If 1st trip DTC P0171, DTC P0172, DTC P0174 or DTC P0175 is not detected and engine is not difficult to start, go to next step.
4. Disconnect appropriate HO2S2 harness connector. (Scheme 17) Check continuity between engine ground and HO2S2 harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect ECM harness connector. see scheme 5 On bank 1, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 88. (Scheme 12) On bank 2, check continuity of White wire between HO2S2 harness connector terminal No. 2 and ECM harness connector terminal No. 90. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 8.
7. Using CONSULT-II, select FUEL INJECTION in ACTIVE TEST mode. Select HO2S2 (B1)/(B2) as the monitor item. Adjust FUEL INJECTION to +25%. HO2S2 (B1)/(B2) voltage should be more than.63 volt at least once. Adjust FUEL INJECTION to -25%. HO2S2 (B1)/(B2) voltage should be less than.48 volt at least once. If operation is as specified, go to step 10. If operation is not as specified, replace HO2S2.
8. Measure voltage between ground and ECM terminal No. 88 (bank 1) or No. 90 (bank 2) by backprobing. While observing voltmeter, snap throttle to 4000 RPM at least 10 times. Voltage should be more than.63 volt at least once. If voltage is as specified, go to step 10. If voltage is not as specified, go to next step.
9. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. Voltage should be less than.48 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, replace HO2S2.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature. Select DATA MONITOR mode with CONSULT-II. While holding engine speed at 2000 RPM, observe HO2S1 (B1)/(B2) voltage with CONSULT-II. Voltage should go above .70 volt at least once. Voltage should go below .21 volt at least once. If voltage is as specified, go to next step. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S20345771482002100300000) .
2. Let engine idle for at least 5 minutes. Maintain the following conditions for at least 50 consecutive seconds: B/FUEL SCHDL: 2.8 msec or more (on 2.5L) or 2.5 msec or more (on 3.5L). ENG SPEED: more than 1600 RPM (on 2.5L) or more than 1500 RPM (on 3.5L). VHCL SPEED SE: more than 44 MPH. NOTE: DTC P0134 and/or DTC P0154 may be displayed on CONSULT-II during this test. If DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S20345771482002100300000) . If DTC is not detected, system is okay at this time.

Note. Use the following test to check overall function of closed loop fuel control. During this test, DTC may not be confirmed.

1. Start engine and warm to normal operating temperature. On 2.5L, measure voltage between ground and ECM terminal No. 92 by backprobing. see scheme 5and (Scheme 12). On 3.5L, measure voltage between ground and ECM terminal No. 91 (bank 1) or No. 92 (bank 2) by backprobing.
2. On all models, monitor voltmeter with engine at 2000 RPM. Voltage should be less than.21 volt at least once and more than.70 volt at least once. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S20345771482002100300000). If voltage is as specified, system is okay at this time.

See DTC P0133 OR DTC P0153: HO2S1 .

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for at least 60 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

See appropriate article in BRAKES.

Note. Before proceeding, ensure battery voltage is more than 10.5 volts at idle.

Turn ignition on Select DATA MONITOR mode with scan tool. Start engine and let it idle for at least 10 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

See appropriate article in BRAKES.

Note. Use the following test to check overall function of cooling fan. During this test, 1st trip DTC may not be confirmed.

1. Allow engine to cool. Check coolant level in radiator and reservoir tank. If coolant level is okay, go to next step. If coolant level is low, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22826175132002100300000) .
2. If coolant was filled by customer, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22826175132002100300000) . If coolant was not filled by customer, go to next step.
3. Turn ignition on. Perform COOLING FAN in ACTIVE TEST mode with CONSULT-II. If cooling fan operates properly, system is okay at this time. If cooling fan does not operate properly, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22826175132002100300000) .

Note. Use the following test to check overall function of cooling fan. During this test, 1st trip DTC may not be confirmed.

1. Allow engine to cool. Check coolant level in radiator and reservoir tank. If coolant level is okay, go to next step. If coolant level is low, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22826175132002100300000).
2. If coolant was filled by customer, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22826175132002100300000). If coolant was not filled by customer, go to next step.
3. Start engine. Set temperature control lever to full cold position. Turn A/C and blower on. Let engine idle for a few minutes with A/C operating.
4. Cooling fan should operate at low speed. If cooling fan operates as specified, go to next step. If cooling fan does not operate as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22826175132002100300000).
5. Turn ignition off. Turn A/C and blower off. Disconnect ECT sensor harness connector. (Scheme 26)or (Scheme 27). Connect a 150 ohm resistor between ECT sensor harness connector terminals. Start engine.
6. Cooling fan should operate at high speed. If cooling fan operates as specified, system is okay at this time. If cooling fan does not operate as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22826175132002100300000).

1. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 4.
2. Start engine and let it idle. Select COOLING FAN in ACTIVE TEST mode with CONSULT-II. Press LOW on CONSULT-II screen. If cooling fans operate at low speed, go to next step. If cooling fans do not operate at low speed, go to «COOLING FAN LOW SPEED CIRCUIT»(ref-135505-S12675819952002100300000).
3. Press HIGH on CONSULT-II screen. If cooling fans operate at high speed, go to step 6. If cooling fans do not operate at high speed, go to «COOLING FAN HIGH SPEED CIRCUIT»(ref-135505-S04070136322002100300000).
4. Start engine and let it idle. Turn A/C and blower on. If cooling fans operate at low speed, go to next step. If cooling fans do not operate at low speed, go to «COOLING FAN LOW SPEED CIRCUIT»(ref-135505-S12675819952002100300000).
5. Turn ignition off. Turn A/C and blower off. Disconnect ECT sensor harness connector. (Scheme 26)or (Scheme 27). Connect a 150 ohm resistor between ECT sensor harness connector terminals. Start engine. If cooling fans operate at high speed, go to next step. If cooling fans do not operate at high speed, go to «COOLING FAN HIGH SPEED CIRCUIT»(ref-135505-S04070136322002100300000).
6. Pressure test cooling system and radiator cap. Check thermostat operation. Radiator cap relief pressure should be 8.6-14.2 psi (59-98 kPa). Thermostat opening temperature should be 180°F (82°C). Repair coolant leaks or replace radiator cap or thermostat as necessary. If no problems are found, go to next step.
7. Remove ECT sensor, and place in heated water. Measure resistance between sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE»(ref-135505-S15791428152002022200000) table under DIAGNOSTIC PROCEDURE under DTC P0117 OR DTC P0118: ENGINE COOLANT TEMPERATURE SENSOR. If resistance is not as specified, replace ECT sensor. If resistance is as specified, check for other possible causes of engine overheating and repair as necessary.

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for one second. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Disconnect electric throttle control actuator harness connector. (Scheme 32) Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). (Scheme 33) If voltage is about 5 volts, go to step 3. If voltage is not about 5 volts, go to next step.
2. Check the following: Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14 Check for open or short between electric throttle control actuator and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and electric throttle control actuator harness connector terminal No. 5 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for open or short between electric throttle control actuator and ECM. On A/T models, check for open or short between electric throttle control actuator and transmission control module. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of Green wire between electric throttle control actuator harness connector terminal No. 2 and ECM harness connector terminal No. 74. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Perform throttle valve closed position learning. See «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-135505-S20463220872002101400000) under PROGRAMMING. Turn ignition on. Shift transmission into Drive (A/T models) or first gear (M/T models). Measure voltage between ground and ECM terminals No. 73 (TP sensor No. 1 signal) and No. 74 (TP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «TP SENSOR VOLTAGE (4-CYLINDER)»(ref-135505-S37022328102002021100000) table under DIAGNOSTIC PROCEDURE (4-CYLINDER) under DTC P0221, DTC P0222 OR DTC P0223: TP SENSOR. If voltage is as specified, go to next step. If voltage is not as specified, replace electric throttle control actuator.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect electric throttle control actuator harness connector. (Scheme 34) Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). (Scheme 33) If voltage is about 5 volts, go to step 3. If voltage is not about 5 volts, go to next step.
2. Check the following: Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 15 Check for open or short between electric throttle control actuator and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and electric throttle control actuator harness connector terminal No. 5 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for open or short between electric throttle control actuator and ECM. On A/T models, check for open or short between electric throttle control actuator and transmission control module. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of Green wire between electric throttle control actuator harness connector terminal No. 2 and ECM harness connector terminal No. 84. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
6. Reconnect all harness connectors. Perform throttle valve closed position learning. See «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-135505-S20463220872002101400000) under PROGRAMMING. Turn ignition on. Shift transmission into Drive (A/T models) or first gear (M/T models). Measure voltage between ground and ECM terminals No. 73 (TP sensor No. 1 signal) and No. 74 (TP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «TP SENSOR VOLTAGE (V6)»(ref-135505-S29275684592002091900000) table under DIAGNOSTIC PROCEDURE (V6) under DTC P0221, DTC P0222 OR DTC P0223: TP SENSOR. If voltage is as specified, go to next step. If voltage is not as specified, replace electric throttle control actuator.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on. Select DATA MONITOR mode with scan tool. Turn ignition off and wait at least 10 seconds. Turn ignition on. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Remove air intake duct. Check for foreign matter between throttle valve and throttle housing. If foreign matter is found, remove foreign matter, and clean throttle housing. If foreign matter is not found, go to next step.
2. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000) .

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on. Select DATA MONITOR mode with scan tool. Turn ignition off, wait at least 10 seconds, then turn ignition on. Repeat 32 times. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Remove air intake duct. Check for foreign matter between throttle valve and throttle housing. If foreign matter is found, remove foreign matter, and clean throttle housing. If foreign matter is not found, go to next step.
2. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000) .

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for one second. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 19) Disconnect APP sensor harness connector. (Scheme 35) Measure voltage between ground and APP sensor harness connector terminal No. 1 (Orange wire). (Scheme 36) If voltage is about 2.5 volts, go to step 3. If voltage is not about 2.5 volts, go to next step.
2. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminal No. 6 (Orange wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 14 Check for open or short between APP sensor and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and APP sensor harness connector terminal No. 5 (Green wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminals No. 3 (Black wire) and No. 8 (Green wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 14 Check for open or short between APP sensor and ECM. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White/Black wire between APP sensor harness connector terminal No. 6 and ECM harness connector terminal No. 76. (Scheme 12) Also, check circuits for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 7.
6. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminal No. 2 (White/Black wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 14 Check for open or short between APP sensor and ECM. Repair as necessary.
7. Reconnect all harness connectors. Turn ignition on. Measure voltage between ground and ECM terminals No. 75 (APP sensor No. 1 signal) and No. 76 (APP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «APP SENSOR VOLTAGE (4-CYLINDER)»(ref-135505-S36450797752002041200000) table under DIAGNOSTIC PROCEDURE (4-CYLINDER) under DTC P0226, DTC P0227 OR DTC P0228: ACCELERATOR PEDAL POSITION SENSOR. If voltage is as specified, go to next step. If voltage is not as specified, replace APP sensor.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten engine ground bolts. (Scheme 20) Disconnect APP sensor harness connector. (Scheme 35) Measure voltage between ground and APP sensor harness connector terminal No. 1 (Orange wire). (Scheme 36) If voltage is about 2.5 volts, go to step 3. If voltage is not as specified, go to next step.
2. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminal No. 6 (Orange wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 15 Check for open or short between APP sensor and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and APP sensor harness connector terminal No. 5 (Green wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminal No. 8 (Green wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 15 Check for open or short between APP sensor and ECM. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of White/Black wire between APP sensor harness connector terminal No. 6 and ECM harness connector terminal No. 74. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 7.
6. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminal No. 2 (White/Black wire). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 15 Check for open or short between APP sensor and ECM. Repair as necessary.
7. Reconnect all harness connectors. Turn ignition on. Measure voltage between ground and ECM terminals No. 73 (APP sensor No. 1 signal) and No. 74 (APP sensor No. 2 signal) by backprobing, with accelerator pedal in specified positions. See «APP SENSOR VOLTAGE (V6)»(ref-135505-S31712546992002091900000) table under DIAGNOSTIC PROCEDURE (V6) under DTC P0226, DTC P0227 OR DTC P0228: ACCELERATOR PEDAL POSITION SENSOR. If voltage is as specified, go to next step. If voltage is not as specified, replace APP sensor.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Note. Before proceeding, ensure battery voltage is more than 10 volts at idle.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for one second. If DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If DTC is not detected, system is okay at this time.

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 19) Disconnect electric throttle control actuator harness connector. (Scheme 32) Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to step 4. If voltage is not about 5 volts, go to next step.
2. Check short to ground and short to voltage in Red wire between ECM harness connector terminal No. 65 and the following: Electric throttle control actuator harness connector terminal No. 1. APP sensor harness connector terminal No. 2. MAF sensor harness connector terminal No. 2. EVAP-CSPS harness connector terminal No. 1. Refrigerant pressure sensor harness connector terminal No. 1. see scheme 5and (Scheme 12). Also, check the following: Inspect ECM pins for damage. Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14 If problem is found, repair as necessary. If problem is not found, go to next step.
3. Check the following: APP sensor. See step 7 under DIAGNOSTIC PROCEDURE (4-CYLINDER) under DTC P0226, DTC P0227 OR DTC P0228: ACCELERATOR PEDAL POSITION SENSOR. MAF sensor. See step 6 under DIAGNOSTIC PROCEDURE under DTC P0101: MASS AIRFLOW SENSOR. EVAP-CSPS. See step 8 under DIAGNOSTIC PROCEDURE under DTC P0452: EVAP CONTROL SYSTEM PRESSURE SENSOR. Refrigerant pressure sensor. See «SYSTEM & COMPONENT TESTING»(ref-135812) article. If problem is found, repair as necessary. If problem is not found, go to step 6.
4. Check TP sensor. See step 6 under DIAGNOSTIC PROCEDURE (4-CYLINDER) under DTC P0221, DTC P0222 OR DTC P0223: TP SENSOR. If problem is found, go to next step. If problem is not found, go to step 6.
5. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000).
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 20) Disconnect electric throttle control actuator harness connector. (Scheme 34) Turn ignition on. Measure voltage between ground and electric throttle control actuator harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to step 4. If voltage is not about 5 volts, go to next step.
2. Check short to ground and short to voltage in Red wire between ECM harness connector terminal No. 111 and the following: Electric throttle control actuator harness connector terminal No. 1. APP sensor harness connector terminal No. 2. MAF sensor harness connector terminal No. 2. EVAP-CSPS harness connector terminal No. 1. PSP sensor harness connector terminal No. 3. Refrigerant pressure sensor harness connector terminal No. 1. see scheme 5and (Scheme 12). Also, inspect ECM pins for damage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Check the following: APP sensor. See step 7 under DIAGNOSTIC PROCEDURE (V6) under DTC P0226, DTC P0227 OR DTC P0228: ACCELERATOR PEDAL POSITION SENSOR. MAF sensor. See step 6 under DIAGNOSTIC PROCEDURE under DTC P0101: MASS AIRFLOW SENSOR. EVAP-CSPS. See step 8 under DIAGNOSTIC PROCEDURE under DTC P0452: EVAP CONTROL SYSTEM PRESSURE SENSOR. PSP sensor. See step 5 under DIAGNOSTIC PROCEDURE under DTC P0550: POWER STEERING PRESSURE SENSOR. Refrigerant pressure sensor. See «SYSTEM & COMPONENT TESTING»(ref-135812) article. If problem is found, repair as necessary. If problem is not found, go to step 6.
4. Check TP sensor. See step 6 under DIAGNOSTIC PROCEDURE (V6) under DTC P0221, DTC P0222 OR DTC P0223: TP SENSOR. If problem is found, go to next step. If problem is not found, go to step 6.
5. Replace electric throttle control actuator. Perform throttle valve closed position learning and idle air volume learning. See «PROGRAMMING»(ref-135505-S24693464762002022200000).
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

See DTC P0442: EVAP CONTROL SYSTEM .

See DTC P0442: EVAP CONTROL SYSTEM .

1. Start engine and warm to normal operating temperature.
2. Turn ignition off and wait at least 10 seconds. Turn ignition on.
3. Select PURG VOL CN/V P1444 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT-II.
4. Press START. Start engine and let it idle until TESTING on CONSULT-II changes to COMPLETED (it will take about 10 seconds).
5. If TESTING is not displayed after 5 minutes, retry from step 2 .
6. Press SELF-DIAG RESULTS. If NG is displayed, go to appropriate DIAGNOSTIC PROCEDURE.
7. If OK is displayed, system is okay at this time.

1. Start engine and warm to normal operating temperature. Turn ignition switch off and wait at least 10 seconds. Start engine and let it idle for at least 20 seconds.
2. Select MODE 7 with scan tool. If 1st trip DTC is detected, go to appropriate DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect EVAP-CPVCSV harness connector. (Scheme 46) Turn ignition on. Measure voltage between ground and EVAP-CPVCSV harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 44 (10-amp) located in Intelligent Power Distribution Module (IPDM). see scheme 10and see scheme 11. Check for poor connection at IPDM connector E124 terminal No. 19 (Red/Yellow wire). see scheme 12 Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 8A (Red/Yellow wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 2 (Red/Yellow wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14 Check for open or short between EVAP-CPVCSV and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Purple/Red wire between EVAP-CPVCSV harness connector terminal No. 2 and ECM harness connector terminal No. 13. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Check for disconnection or improper connection of hose connected to EVAP-CSPS. (Scheme 45) If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect EVAP-CSPS harness connector. Check connectors for water. If water exists, replace EVAP-CSPS. If water does not exist, go to next step.
6. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (White wire) by backprobing. Voltage should be 3.2-4.8 volts. Apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
7. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 9.
8. Reconnect all harness connectors. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 10. If operation is not as specified, go to next step.
9. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage between EVAP-CPVCSV terminals. (Scheme 48) Check for airflow between ports "A" and "B". Air should flow. Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
10. Disconnect hose from EVAP-CVCV. Check hose for blockage. If blockage is found, clean with compressed air. If blockage is not found, go to next step.
11. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
12. If using CONSULT-II, go to next step. If using generic scan tool, go to step 14.
13. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 15. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
14. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
15. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 18. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 17.
16. Inspect EVAP canister for damage. Replace, if necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. If problem is not found, go to next step.
17. Remove water separator and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". (Scheme 51) Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
18. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition off. Disconnect EVAP-CPVCSV harness connector. (Scheme 47) Turn ignition on. Measure voltage between ground and EVAP-CPVCSV harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check for poor connection at Intelligent Power Distribution Module (IPDM) connector E122 terminal No. 35 (Red wire). see scheme 12 Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 4B (Red wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 5 (Red wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 15 Check for poor connection at Green, 8-pin connector F44 terminal No. 4 (Red/Yellow wire). (Scheme 11) Connector F44 is located on top front of engine. see scheme 15 Check for open or short between EVAP-CPVCSV and IPDM. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Purple/Red wire between EVAP-CPVCSV harness connector terminal No. 2 and ECM harness connector terminal No. 10. (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following: Check for poor connection at Green, 8-pin connector F44 terminal No. 3 (Purple/Red wire). (Scheme 11) Connector F44 is located on top front of engine. see scheme 15 Check for open or short between EVAP-CPVCSV and ECM. Repair as necessary.
5. Check for disconnection or improper connection of hose connected to EVAP-CSPS. (Scheme 45) If problem is found, repair as necessary. If problem is not found, go to next step.
6. Disconnect EVAP-CSPS harness connector. Check connectors for water. If water exists, replace EVAP-CSPS. If water does not exist, go to next step.
7. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 60 (White wire) by backprobing. Voltage should be 3.0-3.6 volts. Apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
8. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 10.
9. Reconnect all harness connectors. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 11. If operation is not as specified, go to next step.
10. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage between EVAP-CPVCSV terminals. (Scheme 48) Check for airflow between ports "A" and "B". Air should flow. Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
11. Disconnect hose from EVAP-CVCV. Check hose for blockage. If blockage is found, clean with compressed air. If blockage is not found, go to next step.
12. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
13. If using CONSULT-II, go to next step. If using generic scan tool, go to step 15.
14. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 16. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
15. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
16. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 19. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 18.
17. Inspect EVAP canister for damage. Replace, if necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. If problem is not found, go to next step.
18. Remove water separator and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". (Scheme 51) Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
19. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on. Select DATA MONITOR with scan tool. Start engine. Drive vehicle at a speed of about 50 MPH for a maximum of 15 minutes. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect hose from EVAP-CVCV. (Scheme 45) Check hose for blockage. If blockage exists, clean hose with compressed air. If blockage does not exist, go to next step.
2. Remove water separator and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". (Scheme 51) Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
3. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
4. If using CONSULT-II, go to next step. If using generic scan tool, go to step 6.
5. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 7. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
6. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
7. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 9. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to next step.
8. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. If a problem is found, repair hose or replace EVAP canister as necessary. If no problem is found, go to next step.
9. Check for disconnection or improper connection of hose connected to EVAP-CSPS. If a problem is found, repair as necessary. If no problem is found, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS. If water does not exist in connector, go to next step.
10. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Voltage should be 3.2-4.8 volts (on 2.5L) or 3.0-3.6 volts (on 3.5L). On 2.5L, apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. On 3.5L, apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. On all models, if voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
11. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Note. Perform DTC WORK SUPPORT when fuel level is between 1/4 and 3/4 and vehicle is placed on a level surface. Perform test when ambient temperature is 32-86°F (0-30°C).

1. Open hood. Turn ignition on. Turn ignition off and wait at least 10 seconds. Turn ignition on and select DATA MONITOR mode with CONSULT-II.
2. Ensure the following conditions are met: COOLAN TEMP/S: 32-158°F (0-70°C). INT/A TEMP SE: 32-86°F (0-30°C).
3. Select EVAP SML LEAK P0442/P1442 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT- II.
4. Follow instructions displayed on CONSULT-II. If engine speed cannot be maintained within range displayed on CONSULT-II screen, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.
5. If OK is displayed, system is okay at this time. If NG is displayed, go to next step. NOTE: Ensure EVAP hoses are connected to EVAP canister purge volume control valve properly.
6. Stop engine and wait at least 10 seconds. Turn ignition on. Disconnect hose from water separator. (Scheme 45) Select VENT CONTROL/V of ACTIVE TEST mode with CONSULT-II.
7. Touch ON and OFF alternately. When VENT CONTROL/V is ON, air should flow between ports "A" and "B". (Scheme 49) When VENT CONTROL/V is OFF, air should not flow between ports "A" and "B".
8. If operation is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S24849024282002100700000). If operation is as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S32886501052002092400000) under DTC P0442: EVAP CONTROL SYSTEM.

Note. Use the following test to check overall function of EVAP-CVCV circuit. During this test, DTC may not be confirmed.

1. Disconnect hose from water separator. (Scheme 45) Disconnect EVAP-CVCV harness connector. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow through EVAP-CVCV. Remove jumper wires. Air should flow.
2. If operation is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S24849024282002100700000). If operation is as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S32886501052002092400000) under DTC P0442: EVAP CONTROL SYSTEM.

1. Turn ignition off. Disconnect hose from EVAP-CVCV. (Scheme 45) Check hose for blockage. If blockage exists, clean hose with compressed air. If blockage does not exist, go to next step.
2. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
3. If using CONSULT-II, go to next step. If using generic scan tool, go to step 5.
4. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 6. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
5. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
6. Remove vacuum cut valve. (Scheme 45) Plug ports "C" and "D". (Scheme 60) Using a hand vacuum pump, apply vacuum to port "A". Vacuum should not exist at port "B". Apply vacuum to port "B". Vacuum should exist at port "A". Blow air into port "B". Air should flow out of port "A" with some resistance. Unplug ports "C" and "D". Blow air into port "A". Air should flow freely out of port "C". Blow air into port "B". Air should flow freely out of port "D". If operation is as specified, go to next step. If operation is not as specified, replace vacuum cut valve.
7. Remove EVAP canister with EVAP-CVCV attached. Invert EVAP canister and attempt to drain water from EVAP canister. If water drains from EVAP canister, go to next step. If water does not drain from EVAP canister, go to step 9.
8. Weigh EVAP canister with EVAP-CVCV attached. If EVAP canister weighs less than 4.0 lbs. (1.8 kg), go to next step. If EVAP canister weighs 4.0 lbs. (1.8 kg) or more, inspect EVAP canister for damage and hoses to water separator for poor connections or blockage. Repair as necessary.
9. Check for disconnection or improper connection of hose connected to EVAP-CSPS. If problem is found, repair as necessary. If problem is not found, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS. If water does not exist in connector, go to next step.
10. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Voltage should be 3.2-4.8 volts (on 2.5L) or 3.0-3.6 volts (on 3.5L). On 2.5L, apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. On 3.5L, apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. On all models, if voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
11. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 60

Note. If fuel filler cap was removed, fuel tank was filled/drained or any EVAP control system parts were removed, wait at least one hour before performing DTC confirmation test.

Note. Before proceeding, ensure battery voltage is more than 11 volts at idle.

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II.
2. Ensure the following conditions are met: FUEL LEVEL SE: 0.25-1.15 volts. COOLAN TEMP/S: 32-90°F (0-32°C). FUEL T/TMP SE: 32-95°F (0-35°C). INT A/TEMP SE: more than 32°F (0°C). If all conditions are met, go to next step. If all conditions are not met, turn ignition off, and allow vehicle to cool. Or, drain/refill fuel until FUEL LEVEL SE indicates 0.25-1.15 volts. Wait at least one hour, then go to step 1 .
3. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select EVAP V/S LEAK P0456/P1456 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT- II. Follow instructions displayed. NOTE: If engine speed cannot be maintained within range displayed on CONSULT-II screen, perform BASIC INSPECTION. See «ON-VEHICLE ADJUSTMENTS»(ref-135501) article.
4. If OK is displayed on CONSULT-II, system is okay at this time. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S42028230342002100700000) .

Note. Use the following test to check overall function of EVAP very small leak function. During this test, DTC may not be confirmed.

1. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 46) Connect a suitable pressure pump with hose and gauge to adapter.
2. Turn ignition on. Using scan tool, select MODE 8 to close EVAP-CVCV and open vacuum cut valve bypass valve. Apply.39 psi (2.7 kPa) to EVAP system.
3. Observe gauge for 60 seconds. If pressure drops more than.06 psi (.4 kPa), go to «DIAGNOSTIC PROCEDURE»(ref-135505-S42028230342002100700000). If pressure does not drop more than.06 psi (.4 kPa), system is okay at this time.

1. Ensure fuel cap is original equipment. Attempt to turn fuel cap clockwise. If fuel cap was tightened properly, go to next step. If fuel cap was not tightened properly, clean fuel cap and filler neck with compressed air.
2. While removing fuel cap, listen for air escaping from fuel tank. If air escaped from fuel tank, go to step 4. If air did not escape from fuel tank, go to next step.
3. Using a suitable hand vacuum/pressure pump with Fuel Filler Cap Adapter (MLR-8382), apply pressure and vacuum to fuel cap. Fuel cap vacuum relief valve should open when pressure reaches 2.22-2.90 psi (15.3-20.0 kPa) and when vacuum reaches.98-1.78 in. Hg (3.3-6.0 kPa). If operation is as specified, go to next step. If operation is not as specified, replace fuel cap.
4. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 46) Connect a suitable pressure pump to adapter. DO NOT use compressed air. If using CONSULT-II, go to next step. If using generic scan tool, go to step 6.
5. Turn ignition on. Select EVAP SYSTEM CLOSE of WORK SUPPORT mode with CONSULT-II. Press START. Observe pressure indicator on CONSULT-II. Apply pressure to EVAP system until pressure indicator reaches middle of bar graph. DO NOT exceed.6 psi (4.12 kPa) of pressure. Using Leak Detector (J41416), locate EVAP leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to step 7.
6. Turn ignition off. Disconnect EVAP Canister Vent Control Valve (EVAP-CVCV) and vacuum cut valve by-pass valve harness connectors. (Scheme 45) Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. (Scheme 50) Apply.2-.4 psi (1.38-2.76 kPa) of pressure to EVAP service port. DO NOT exceed.6 psi (4.12 kPa) of pressure. Remove pressure pump from EVAP service port. Using Leak Detector (J41416), locate EVAP system leak. See «VACUUM DIAGRAMS»(ref-135815) article. If a leak is found, repair as necessary. If no leak is found, go to next step.
7. Remove water separator and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". (Scheme 51) Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
8. Check EVAP-CVCV, "O" ring and circuit. Perform «DTC CONFIRMATION TEST»(ref-135505-S32409333392002100700000) under DTC P1446: EVAP CANISTER VENT CONTROL VALVE. If 1st trip DTC is detected, repair as necessary. If 1st trip DTC is not detected, go to next step.
9. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step 11. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step 11.
10. Inspect EVAP canister for damage. Replace, if necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. If problem is not found, go to next step.
11. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
12. Disconnect EVAP-CPVCSV hose from EVAP service port. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Press "Qu" on CONSULT-II screen to increase PURG VOL CONT/V opening to 100 percent. Check for vacuum at disconnected hose while increasing engine speed to 2000 RPM. If vacuum exists, go to step 15. If vacuum does not exist, go to step 14.
13. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect EVAP-CPVCSV hose from EVAP service port. Start engine and let it idle for at least 80 seconds. While quickly increasing engine speed to 2000 RPM, check for vacuum at EVAP-CPVCSV hose. If vacuum exists, go to step 15. If vacuum does not exist, go to next step.
14. Check EVAP system vacuum hoses for blockages or leaks. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair as necessary. If problem is not found, go to next step.
15. If using CONSULT-II, go to next step. If using generic scan tool, go to step 17.
16. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step 18. If operation is not as specified, go to next step.
17. Turn ignition off. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage to EVAP-CPVCSV terminals. (Scheme 48) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
18. Remove fuel pump assembly. Measure resistance between fuel pump assembly connector terminals No. "T" and "E", with FTT sensor submerged in heated water. (Scheme 31) Resistance should be within acceptable range shown in illustration. (Scheme 25) If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
19. Remove EVAP-CSPS with its harness connector connected. (Scheme 45) Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (White wire) by backprobing. see scheme 5and (Scheme 12). Voltage should be 3.2-4.8 volts. Apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
20. Check EVAP purge line at fuel tank and EVAP canister for leaks or improper connection. See «VACUUM DIAGRAMS»(ref-135815) article. If a problem is found, repair as necessary. If purge line is okay, clean with compressed air, then go to next step.
21. Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness or improper connection. See «VACUUM DIAGRAMS»(ref-135815) article. If problem is found, repair or replace hoses or tubes as necessary. If problem is not found, go to next step.
22. Check signal line and recirculation line between filler neck and fuel tank for clogging, kink, cracks, looseness and improper connection. If problem is found, repair or replace hoses, tubes or filler neck as necessary. If problem is not found, go to next step.
23. Check refueling control valve. See «FUEL EVAPORATION CONTROL SYSTEM»(ref-135812-S37782422942002022500000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If refueling control valve is okay, go to next step. If refueling control valve is not okay, replace fuel tank.
24. Measure resistance between fuel pump assembly terminals "G" and "E" as shown in illustration. (Scheme 52) If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor.
25. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on. Select DATA MONITOR mode with scan tool. Wait at least 5 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity between body ground and Black/Red wire at ECM harness connector terminal No. 77 (on 2.5L) or No. 78 (on 3.5L). (Scheme 12) Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 3.
2. Check the following: Check for poor connection at White, 24-pin connector F59 terminal No. 16 (Black/Red wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check for open or short between ECM and body ground. Repair as necessary.
3. Remove fuel pump assembly. Measure resistance between fuel pump assembly terminals "G" and "E" as shown in illustration. (Scheme 52) If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor.
4. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and wait at least 5 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Turn ignition off and on. Select VC/V BYPASS/V in ACTIVE TEST mode with CONSULT-II. Press ON/OFF on CONSULT-II screen. Clicking noise should be heard from vacuum cut valve by-pass valve. For location (Scheme 45) If clicking noise is heard, go to step 8. If clicking noise is not heard, go to next step.
3. Turn ignition off. Disconnect vacuum cut valve by-pass valve harness connector. Turn ignition on. Measure voltage between ground and vacuum cut valve by-pass valve harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 5. If battery voltage does not exist, go to next step.
4. Check the following: Check fuse No. 44 (10-amp) located in Intelligent Power Distribution Module (IPDM). see scheme 10and see scheme 11. Check for poor connection at IPDM connector E124 terminal No. 19 (Red/Yellow wire). see scheme 12 Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 8A (Red/Yellow wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 2 (Red/Yellow wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14 Check for poor connection at White, 12-pin connector F55 terminal No. 2 (Red/Yellow wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open or short between vacuum cut valve by-pass valve and fuse. Repair as necessary.
5. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Brown wire between vacuum cut valve by-pass valve harness connector terminal No. 2 and ECM harness connector terminal No. 8 (on 2.5L) or No. 28 (on 3.5L). (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If circuit is okay, go to step 7.
6. Check the following: Check for poor connection at White, 12-pin connector F55 terminal No. 1 (Brown wire). (Scheme 53) Connector F55 is located near ECM. see scheme 14or see scheme 15. Check for open or short between vacuum cut valve by-pass valve and ECM. Repair as necessary.
7. If using CONSULT-II, go to next step. If using generic scan tool, go to step 9.
8. Reconnect all harness connectors. Turn ignition on. Perform VC/V BYPASS/V in ACTIVE TEST mode with CONSULT-II. When VC/V BYPASS/V is ON, air should flow through vacuum cut valve by-pass valve. When VC/V BYPASS/V is OFF, air should not flow through vacuum cut valve by-pass valve. Valve should switch in less than one second. If operation is as specified, go to step 10. If operation is not as specified, replace vacuum cut valve by-pass valve.
9. Remove vacuum cut valve by-pass valve. Using jumper wires, apply battery voltage to valve terminals. (Scheme 61) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. Valve should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, replace vacuum cut valve by-pass valve.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 61

Note. For best results, perform test when ambient temperature is more than 32°F (0°C).

1. Turn ignition on. Start engine and warm to normal operating temperature.
2. Turn ignition off and wait at least 10 seconds. Start engine and let it idle for at least 70 seconds.
3. Select VC CUT/V BP/V P1491 of EVAPORATIVE SYSTEM in DTC WORK SUPPORT mode with CONSULT-II.
4. Press START on CONSULT-II screen. When the following conditions are met, TESTING will be displayed on CONSULT-II screen. 2.5L: ENG SPEED: 1000-3800 RPM. Vehicle speed: 22-75 MPH. B/FUEL SCHDL: 1.0-7.2 msec. 3.5L: ENG SPEED: more than 1000 RPM. Vehicle speed: more than 23 MPH. B/FUEL SCHDL: 1.0-10.0 msec. Maintain conditions continuously until TESTING changes to COMPLETED (it will take at least 30 seconds). If TESTING is not displayed after 5 minutes, retry from step 2 .
5. Press SELF-DIAG RESULTS. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S42361758382002100700000) . If OK is displayed, system is okay at this time.

Note. Use the following test to check overall function of vacuum cut valve by-pass valve. During this test, 1st trip DTC may not be confirmed.

Remove vacuum cut valve and vacuum cut valve by-pass valve as an assembly. (Scheme 45) Apply vacuum to port "A". (Scheme 62) Vacuum should not exist at port "B". Apply vacuum to port "B". Vacuum should exist at port "A". Blow air in port "B". Air should flow out of port "A" with some resistance. Using jumper wires, apply battery voltage to by-pass valve terminals. Air should flow freely through ports "A" and "B" in both directions. If operation is as specified, system is okay at this time. If operation is not as specified, go to DIAGNOSTIC PROCEDURE.

1. Remove vacuum cut valve and vacuum cut valve by-pass valve as an assembly, leaving harness connected. (Scheme 45) Apply vacuum to port "A". (Scheme 62) Vacuum should not exist at port "B". Apply vacuum to port "B". Vacuum should exist at port "A". Blow air in port "B". Air should flow out of port "A" with some resistance. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Turn ignition on. Select VC/V BYPASS/V in ACTIVE TEST mode with CONSULT-II. Press ON. Air should flow freely through vacuum cut valve ports "A" and "B" in both directions. If operation is as specified, go to step 4. If operation is not as specified, go to step 6.
3. Disconnect vacuum cut valve by-pass valve harness connector. Using jumper wires, apply battery voltage to by-pass valve terminals. Air should flow freely through ports "A" and "B" in both directions. If operation is as specified, go to next step. If operation is not as specified, go to step 6.
4. Check purge line between EVAP canister and fuel tank for blockage or leak. Also, check fuel tank purge port for blockage. If problem is found, clean or repair as necessary. If purge line and purge port are okay, go to next step.
5. Remove hoses from EVAP canister ports "A" and "B". (Scheme 63) Pinch EVAP-CVCV hose and blow air into port "A". Air should flow freely out of port "B". If operation is as specified, go to step 12. If operation is not as specified, replace EVAP canister.
6. Remove by-pass hoses from vacuum cut valve. Check hoses for blockage. If blockage exists, clean or replace hoses as necessary. If by-pass hoses are okay, go to next step.
7. If using CONSULT-II, go to next step. If using generic scan tool, go to step 9.
8. Reconnect all harness connectors. Turn ignition on. Perform VC/V BYPASS/V in ACTIVE TEST mode with CONSULT-II. When VC/V BYPASS/V is ON, air should flow through vacuum cut valve by-pass valve. When VC/V BYPASS/V is OFF, air should not flow through vacuum cut valve by-pass valve. Valve should switch in less than one second. If operation is as specified, go to step 10. If operation is not as specified, replace vacuum cut valve by-pass valve.
9. Remove vacuum cut valve by-pass valve. Using jumper wires, apply battery voltage to valve terminals. (Scheme 61) Air should flow between ports "A" and "B". Remove jumper wires. Air should not flow. Valve should switch in less than one second. If operation is as specified, go to next step. If operation is not as specified, replace vacuum cut valve by-pass valve.
10. Plug vacuum cut valve ports "C" and "D" with fingers. (Scheme 60) Apply vacuum to port "A". Vacuum should not exist at port "B". Apply vacuum to port "B". Vacuum should exist at port "A". Blow air in port "B". Air should flow out of port "A" with some resistance. Remove fingers from ports "C" and "D". Blow air in port "A". Air should flow freely out of port "C". Blow air in port "B". Air should flow freely out of port "D". If operation is as specified, go to next step. If operation is not as specified, replace vacuum cut valve.
11. Check for disconnection or improper connection of hose connected to EVAP-CSPS. (Scheme 45) If a problem is found, repair as necessary. If no problem is found, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS. If water does not exist in connector, go to next step.
12. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Measure voltage between ground and ECM terminal No. 88 (on 2.5L) or No. 60 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Voltage should be 3.2-4.8 volts (on 2.5L) or 3.0-3.6 volts (on 3.5L). On 2.5L, apply 7.87 in. Hg of vacuum to EVAP-CSPS. Voltage should be 1.0-1.4 volts less than voltage measured with no vacuum applied. On 3.5L, apply 2.76 in. Hg of vacuum to EVAP-CSPS. Voltage should be.4-.6 volt. On all models, if voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
13. Disconnect hose connected to EVAP-CVCV. (Scheme 45) Check hose for blockage. If blockage exists, clean hose with compressed air. If blockage does not exist, remove EVAP-CVCV. Check for rust in port "B". (Scheme 49) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
14. If using CONSULT-II, go to next step. If using generic scan tool, go to step 16.
15. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step 17. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
16. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 49) Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in less than one second. If operation is as specified, go to step 17. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
17. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 62

Scheme 63

1. Turn ignition on. Select DATA MONITOR mode with scan tool. Wait at least 10 seconds.
2. Press CRUISE switch for at least 10 seconds. Release switch. Wait at least 10 seconds.
3. Press ACCEL/RES switch for at least 10 seconds. Release switch. Wait at least 10 seconds.
4. Press COAST/SET switch for at least 10 seconds. Release switch. Wait at least 10 seconds.
5. Press CANCEL switch for at least 10 seconds. Release switch. Wait at least 10 seconds.
6. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S36132865102002100800000) . If 1st trip DTC is not detected, system is okay at this time.

1. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Turn ignition on. Select MAIN SW, RESUME/ACC SW, SET SW and CANCEL SW in DATA MONITOR mode with CONSULT-II. CONSULT-II should indicate ON for each button when it is pressed. CONSULT-II should indicate OFF when every button is released. If operation is as specified, go to step 6. If operation is not as specified, go to step 4.
3. Turn ignition on. Measure voltage between ground and Green/Yellow wire at ECM terminal No. 89 (on 2.5L) or No. 50 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). Voltage should be as follows: When every button is released, voltage should be about 5 volts (on 2.5L) or 4 volts (on 3.5L). When CRUISE switch is pressed, voltage should be about.5 volt. When COAST/SET switch is pressed, voltage should be about 2 volts. When ACCEL/RES switch is pressed, voltage should be about 3 volts. When CANCEL switch is pressed, voltage should be about one volt. If voltage is as specified, go to step 6. If voltage is not as specified, go to next step.
4. Turn ignition off. Disconnect ASCD steering switch harness connector. Check continuity between ground and ASCD switch harness connector terminal No. 2 (Green wire). (Scheme 64) Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 6.
5. Check the following: Check for poor connection at White, 24-pin connector F59 terminal No. 1 (Black wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check Blue, 12-pin joint connector No. 4 (connector F51). (Scheme 24) Connector F51 is located near ECM. see scheme 14or see scheme 15. Check combination switch (spiral cable). Check for open or short between ECM and ASCD steering switch. Repair as necessary.
6. Disconnect ECM harness connector. Check continuity between ASCD switch harness connector terminal No. 1 (Red wire) and ECM harness connector terminal No. 89 (on 2.5L) or No. 50 (on 3.5L). Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 8.
7. Check the following: Check for poor connection at White, 24-pin connector F59 terminal No. 2 (Green/Yellow wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check combination switch (spiral cable). Check for open or short between ECM and ASCD steering switch. Repair as necessary.
8. Measure resistance between ASCD steering switch terminals No. 1 and 2. Resistance should be as follows: When every button is released, resistance should be about 4000 ohms. When CRUISE switch is pressed, resistance should be about zero ohms. When COAST/SET switch is pressed, resistance should be about 660 ohms. When ACCEL/RES switch is pressed, resistance should be about 1480 ohms. When CANCEL switch is pressed, resistance should be about 250 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace ASCD steering switch.
9. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 64

1. Start engine. Ensure TCS is turned off. Select DATA MONITOR mode with scan tool. Drive vehicle at more than 19 MPH for 5 consecutive seconds. NOTE: Vehicle may be driven on road or in shop with drive wheels lifted.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22546022082002100800000) . If 1st trip DTC is not detected, go to next step.
3. While driving vehicle at more than 19 MPH, depress brake pedal for more than 5 seconds, without allowing vehicle speed to drop to 19 MPH.
4. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S22546022082002100800000) . If 1st trip DTC is not detected, system is okay at this time.

1. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 3.
2. Turn ignition on. Select BRAKE SW1 in DATA MONITOR mode with CONSULT-II. On A/T models, when brake pedal is depressed, CONSULT-II should indicate OFF. When brake pedal is released, CONSULT-II should indicate ON. On M/T models, when brake pedal or clutch pedal is depressed, CONSULT-II should indicate OFF. When brake pedal and clutch pedal are released, CONSULT-II should indicate ON. On all models, If operation is as specified, go to step 4. If operation is not as specified, go to step 5 (on M/T models) or step 10 (on A/T models).
3. Turn ignition on. Measure voltage between ground and Green/Black wire at ECM terminal No. 56 (on 2.5L) or No. 59 (on 3.5L) by backprobing. see scheme 5and (Scheme 12). On A/T models, when brake pedal is depressed, voltage should be about zero volts. When brake pedal is released, battery voltage should exist. On M/T models, when brake pedal or clutch pedal is depressed, voltage should be about zero volts. When brake pedal and clutch pedal are released, battery voltage should exist. On all models, If operation is as specified, go to next step. If operation is not as specified, go to step 5 (on M/T models) or step 10 (on A/T models).
4. Select BRAKE SW2 in DATA MONITOR mode with CONSULT-II. Or, measure voltage between ground and Red/Green wire at ECM terminal No. 40 (on 2.5L) or No. 55 (on 3.5L) by backprobing. When brake pedal is released, CONSULT-II should indicate OFF, and voltage should be about zero volts. When brake pedal is depressed, CONSULT-II should indicate ON, and battery voltage should exist. If operation is as specified, go to step 20. If operation is not as specified, go to step 15.
5. Turn ignition off. Disconnect ASCD brake switch harness connector. (Scheme 65) Turn ignition on. Measure voltage between ground and ASCD brake switch harness connector terminal No. 1 (Green/Black wire). When clutch pedal is released, battery voltage should exist. When clutch pedal is depressed, about zero volts should exist. If voltage is as specified, go to step 12. If voltage is not as specified, go to next step.
6. Turn ignition off. Disconnect ASCD clutch switch harness connector. (Scheme 66) Turn ignition on. Measure voltage between ground and ASCD clutch switch harness connector terminal No. 1 (Green wire). If battery voltage exists, go to step 8. If battery voltage does not exist, go to next step.
7. Check the following: Check fuse No. 12 (10-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector E30 terminal 1Q (Green wire). see scheme 9 Check for open or short between ASCD clutch switch and fuse. Repair as necessary.
8. Turn ignition off. Check continuity of Green/Black wire between ASCD clutch switch harness connector terminal No. 2 and ASCD brake switch harness connector terminal No. 1. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
9. Check continuity between ASCD clutch switch terminals. When clutch pedal is fully released, continuity should exist. When clutch pedal is depressed, continuity should not exist. If continuity is as specified, go to step 20. If continuity is not as specified, replace ASCD clutch switch.
10. Turn ignition off. Disconnect ASCD brake switch harness connector. (Scheme 65) Turn ignition on. Measure voltage between ground and ASCD brake switch harness connector terminal No. 1 (Green wire). If battery voltage exists, go to step 12. If battery voltage does not exist, go to next step.
11. Check the following: Check fuse No. 12 (10-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector E30 terminal 1Q (Green wire). see scheme 9 Check for open or short between ASCD brake switch and fuse. Repair as necessary.
12. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Green/Black wire (on A/T models) or Green/Red wire (on (M/T models) between ASCD brake switch harness connector terminal No. 2 and ECM harness connector terminal No. 56 (on 2.5L) or No. 59 (on 3.5L). (Scheme 12) Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 14.
13. Check the following: Check for poor connection at Gray, 10-pin connector F34 terminal No. 9 (Green/Black wire on A/T models; Green/Red wire on M/T models). (Scheme 37) Connector F34 is located in left rear of engine compartment. see scheme 14or see scheme 15. Check for open or short between ECM and ASCD brake switch. Repair as necessary.
14. Check continuity between ASCD brake switch terminals. When brake pedal is fully released, continuity should exist. When brake pedal is depressed, continuity should not exist. If continuity is as specified, go to step 20. If continuity is not as specified, replace ASCD brake switch.
15. Turn ignition off. Disconnect stop lamp switch harness connector. (Scheme 65) Measure voltage between ground and stop lamp switch harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 17. If battery voltage does not exist, go to next step.
16. Check the following: Check fuse No. 20 (10-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector E30 terminal 8Q (Red/Yellow wire). see scheme 9 Check for open or short between stop lamp switch and fuse. Repair as necessary.
17. Disconnect ECM harness connector. Check continuity of Red/Green wire between stop lamp switch harness connector terminal No. 2 and ECM harness connector terminal No. 40 (on 2.5L) or No. 55 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 19.
18. Check the following: Check for poor connection at White, 18-pin connector M7 terminal No. 14 (Red/Green wire). (Scheme 67) Connector M7 is located under left side of instrument panel. see scheme 16 Check Pink, 20-pin joint connector No. 2 (connector M17). (Scheme 68) Connector M17 is located below top left side of instrument panel. see scheme 16 Check for poor connection at White, 24-pin connector F59 terminal No. 9 (Red/Green wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check for open or short between stop lamp switch and ECM. Repair as necessary.
19. Check continuity between stop lamp switch terminals. When brake pedal is fully released, continuity should not exist. When brake pedal is depressed, continuity should exist. If continuity is as specified, go to next step. If continuity is not as specified, replace stop lamp switch.
20. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 65

Scheme 66

Scheme 67

Scheme 68

Start engine. Ensure TCS is turned off. Select DATA MONITOR mode with scan tool. Drive vehicle at more than 25 MPH. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.

1. Check for A/T system DTCs. If problem is found, diagnose A/T system. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If problem is not found, go to next step.
2. Check VSS, VSS circuit and instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Repair as necessary.

1. Turn ignition on. Select P/N POSI SW in DATA MONITOR mode with CONSULT-II.
2. Check P/N POSI SW signal under the following conditions. With transmission in Park or Neutral, ON should be displayed. With transmission not in Park or Neutral, OFF should be displayed. If operation is as specified, go to next step. If operation is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S42647248052002100800000) .
3. Select DATA MONITOR mode with CONSULT-II. Start engine and warm to normal operating temperature.
4. Maintain the following conditions for at least 60 consecutive seconds: 2.5L: ENG SPEED: 1500-3600 RPM. COOLAN TEMP/S: more than 158°F (70°C). B/FUEL SCHDL: 3.0-31.8 msec. VHCL SPEED SE: more than 40 MPH. 3.5L: ENG SPEED: more than 1400 RPM. COOLAN TEMP/S: more than 158°F (70°C). B/FUEL SCHDL: more than 2 msec. VHCL SPEED SE: more than 40 MPH. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S42647248052002100800000) . If 1st trip DTC is not detected, system is okay at this time.

Note. Use the following test to check overall function of PNP switch circuit. During this test, DTC may not be confirmed.

1. To check overall function of PNP switch circuit, turn ignition on. Measure voltage between body ground and Green/Red wire (on A/T models) or Green/White wire (on M/T models) at ECM terminal No. 43 (on 2.5L) or No. 44 (on 3.5L) by backprobing. see scheme 5and (Scheme 12).
2. When transmission is in Park or Neutral, voltage should be about zero volts. On A/T models, when transmission is not in Park or Neutral, battery voltage should exist. On M/T models, when transmission is not in Park or Neutral, voltage should be about 5 volts. On all models, if voltage is as specified, system is okay at this time. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S42647248052002100800000).

1. Turn ignition off. Disconnect PNP switch harness connector. (Scheme 69) Check continuity between body ground and PNP switch harness connector terminal No. 2 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
2. Disconnect ECM harness connector. see scheme 5 Check continuity of Green/Red wire (on A/T models) or Green/White wire (on M/T models) between PNP switch harness connector terminal No. 1 and ECM harness connector terminal No. 43 (on 2.5L) or No. 44 (on 3.5L). (Scheme 12)and (Scheme 70). Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
3. Check continuity between PNP switch terminals No. 1 and 2. When transmission is in Park or Neutral, continuity should exist. When transmission in not Park or Neutral, continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace PNP switch.
4. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 69

Scheme 70

Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for 5 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect VIAS control solenoid valve harness connector. (Scheme 71) Turn ignition on. Measure voltage between ground and VIAS control solenoid valve harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check fuse No. 44 (10-amp) located in Intelligent Power Distribution Module (IPDM). see scheme 10and see scheme 11. Check for poor connection at Super Multiple Junction (SMJ) connector E130 terminal 8A (Red/Yellow wire). (Scheme 10) SMJ connector E130 is located in right rear of engine compartment. see scheme 13 Check for poor connection at Black, 8-pin connector F32 terminal No. 2 (Red/Yellow wire). (Scheme 11) Connector F32 is located in left rear of engine compartment. see scheme 14 Check for open or short between VIAS control solenoid valve and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Yellow/Green wire between VIAS control solenoid valve harness connector terminal No. 2 and ECM harness connector terminal No. 27. (Scheme 12)Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
4. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step 6.
5. Reconnect all harness connectors. Turn ignition on. Perform VIAS SOL VALVE in ACTIVE TEST mode with CONSULT-II. When VIAS SOL VALVE is ON, air should flow between ports "A" and "B", and air should not flow between ports "A" and "C". (Scheme 72) When VIAS SOL VALVE is OFF, air should not flow between ports "A" and "B", and air should flow between ports "A" and "C". It should take less than one second for valve to switch. If operating is as specified, go to step 7. If operation is not as specified, replace VIAS control solenoid valve.
6. Using jumper wires, apply battery voltage between VIAS control solenoid valve terminals. (Scheme 72) Air should flow between ports "A" and "B", and air should not flow between ports "A" and "C". Remove jumper wires. Air should not flow between ports "A" and "B", and air should flow between ports "A" and "C". It should take less than one second for valve to switch. If operating is as specified, go to next step. If operation is not as specified, replace VIAS control solenoid valve.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Scheme 71

Scheme 72

1. Turn ignition on. Fully depress brake pedal for at least 5 seconds. Erase DTC with scan tool. Select DATA MONITOR mode with scan tool.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-135505-S30092301132002100900000) . If 1st trip DTC is not detected, system is okay at this time.

1. Check stop lamp operation while depressing and releasing brake pedal. If stop lamps operate properly, go to step 4. If stop lamps do not operate properly, go to next step.
2. Turn ignition off. Disconnect stop lamp switch harness connector. (Scheme 65) Measure voltage between ground and stop lamp switch harness connector terminal No. 1 (Red/Yellow wire). If battery voltage exists, go to step 4. If battery voltage does not exist, go to next step.
3. Check the following: Check fuse No. 20 (10-amp) located in fuse block under left side of instrument panel. Check for poor connection at fuse block connector E30 terminal 8Q (Red/Yellow wire). see scheme 9 Check for open or short between stop lamp switch and fuse. Repair as necessary.
4. Disconnect ECM harness connector. Check continuity of Red/Green wire between stop lamp switch harness connector terminal No. 2 and ECM harness connector terminal No. 40 (on 2.5L) or No. 55 (on 3.5L). Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step 6.
5. Check the following: Check for poor connection at White, 18-pin connector M7 terminal No. 14 (Red/Green wire). (Scheme 67) Connector M7 is located under left side of instrument panel. see scheme 16 Check Pink, 20-pin joint connector No. 2 (connector M17). (Scheme 68) Connector M17 is located below top left side of instrument panel. see scheme 16 Check for poor connection at White, 24-pin connector F59 terminal No. 9 (Red/Green wire). (Scheme 30) Connector F59 is located near ECM. see scheme 14or see scheme 15. Check for open or short between stop lamp switch and ECM. Repair as necessary.
6. Check continuity between stop lamp switch terminals. When brake pedal is fully released, continuity should not exist. When brake pedal is depressed, continuity should exist. If continuity is as specified, go to next step. If continuity is not as specified, replace stop lamp switch.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-135811-S09892990442002022500000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on and wait at least 3 seconds. Select DATA MONITOR mode with scan tool. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

Turn ignition on. Select CAN COMM SIGNALS in DATA MONITOR mode with scan tool. If OK is displayed for CAN COMM, CAN CIRC 1, CAN CIRC 2 (A/T models only), CAN CIRC 3 (models with TCS only), CAN CIRC 4, CAN CIRC 6 and CAN CIRC 7, system is okay. If OK is not displayed for these circuits, repair communication problem. See appropriate MULTIPLEX CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.