Engine Controls - Self-Diagnostics - Q45: Diagnosis Infiniti Q45 III

ON-BOARD DIAGNOSTICS

Engine Control Module (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 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»(ref-151807-S18189488792003010800000) . If MIL is on, and DTCs are not accessible, check for ECM fail-safe mode. See «FAIL-SAFE MODES»(ref-151807-S29160414772003010800000) . 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 «BASIC INSPECTION»(ref-151800-S17544759622003010800000) under THROTTLE POSITION SENSOR, IGNITION TIMING & IDLE SPEED in ON-VEHICLE ADJUSTMENTS 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»(ref-151807-S03457442352003010800000) 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-151809) article for diagnosis by symptom. If malfunction cannot be verified, problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.
5. Clear DTCs and freeze-frame data. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-151807-S33027059682003010800000) . 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-151807-S29758860322003120900000) table. If DTC does not reset, problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If DTC resets, go to next step.
6. Perform appropriate diagnostic procedure. See «DIAGNOSTIC TESTS»(ref-151807-S34034237072003010800000) . 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»(ref-151807-S06702442472003010800000) .

MULTIPLE DTC PRIORITY IDENTIFICATION

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 16)

Scheme 16

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)»(ref-151807-S40803245402003010800000).
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 17)

Scheme 17

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.

SYSTEM READINESS TEST

Note. SRT procedure was written specifically for use with Nissan's CONSULT-II diagnostic scan tool. Generic scan tools can be used but may have limited functions.

Entering Diagnostic Test Modes

Turn ignition off. Connect scan tool to Data Link Connector (DLC). (Scheme 18) 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-151807-S24998747172003010800000) .
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-151807-S25353647152003010800000) .
3. DATA MONITOR Input/output data in ECM can be read. See «DATA MONITOR MODE»(ref-151807-S16144634032003010800000) .
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-151807-S03457442352003010800000) .
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-151807-S00865136262003010800000) .
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 18

Active Test Mode

For ACTIVE TEST mode descriptions (Scheme 19)

Scheme 19

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

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

ENGINE CONTROL HARNESS CONNECTOR IDENTIFICATION

Scheme 27

Scheme 28

Scheme 29

MAIN HARNESS CONNECTOR IDENTIFICATION

Scheme 30

Scheme 31

DTC Confirmation Test "A"

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Maintain the following conditions for at least 10 consecutive seconds: ENG SPEED: more than 2000 RPM. COOLAN TEMP/S: more than 158°F (70°C). Transmission: 1st or 2nd gear position. Driving condition: driving vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.
2. Maintain the following conditions for at least 20 consecutive seconds: ENG SPEED: idle. COOLAN TEMP/S: more than 158°F (70°C). Transmission: Park or Neutral. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S31018429912003010800000) . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to «DTC CONFIRMATION TEST "B"»(ref-151807-S02235226062003010800000) .

DTC Confirmation Test "B"

Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Maintain the following conditions for at least 20 consecutive seconds

1. ENG SPEED: 2000-3000 RPM (must be a constant speed).
2. COOLAN TEMP/S: 176-194°F (80-90°C).
3. Transmission: 1st or 2nd gear position.
4. Driving condition: driving vehicle uphill (increased engine load) will help maintain the driving conditions required for this test.

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

Diagnostic Procedure

1. Turn ignition off. Disconnect appropriate IVT control position sensor harness connector. (Scheme 32) Turn ignition on. Measure voltage between ground and IVT control position sensor harness connector terminal No. 3 (Green/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 connector F32 terminal No. 4 (Green/Yellow wire). (Scheme 27) Check for poor connection at fuse, fusible link and relay block harness connector E3 terminal 34R (Green/Yellow wire). (Scheme 23) Check fuse No. 58 (10-amp) located in fuse, fusible link and relay block on right side of engine compartment. Check for open or short between IVT control position sensor and fuse. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and IVT control position sensor harness connector terminal No. 1 (Black/Yellow wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 5.
4. Check the following: Check joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check for open or short between engine ground and IVT control position sensor. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of Yellow wire between left IVT control position sensor harness connector terminal No. 2 and ECM harness connector terminal No. 73, or White wire between right IVT control position sensor harness connector terminal No. 2 and ECM harness connector terminal No. 74. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
6. Remove IVT control position sensor. Visually inspect sensor for chipping. Measure resistance of sensor as shown in illustration. (Scheme 51) If resistance is as specified and sensor is not chipped, go to next step. If resistance is not as specified or sensor is chipped, replace IVT control position sensor.
7. Check CKP sensor (POS). See step 7 under DIAGNOSTIC PROCEDURE under DTC P0335: CRANKSHAFT POSITION SENSOR (POS). If sensor is okay, go to next step. If sensor is not okay, replace CKP sensor (POS).
8. Check CMP sensor (PHASE). See step 7 under DIAGNOSTIC PROCEDURE under DTC P0340: CAMSHAFT POSITION SENSOR (PHASE). If sensor is okay, go to next step. If sensor is not okay, replace CMP sensor (PHASE).
9. Check for accumulation of debris on signal pick-up portion of camshaft. Remove debris and clean camshaft as necessary. If accumulation of debris is not present, go to next step.
10. Disconnect joint connectors No. 28 (connector F106) and No. 29 (connector F107) located under right side of instrument panel. (Scheme 27)and (Scheme 31). Check the following: Check continuity of shield circuit (Gray wire) between joint connector No. 28 terminals No. 1 and 3. Check continuity of shield circuit (Gray wire) between joint connector No. 28 terminal No. 3 and joint connector No. 29 terminal No. 3. Check continuity between ground and shield circuit (Gray wire) at joint connector No. 29 terminal No. 3. Check joint connectors No. 28 and 29. Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
11. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 32

DTC Confirmation Test (Using CONSULT-II)

Start engine and warm to normal operating temperature. Turn ignition off and wait 10 seconds. 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 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 warm to normal operating temperature. Turn ignition off and wait 10 seconds. 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 DIAGNOSTIC PROCEDURE . If DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect appropriate HO2S harness connector. (Scheme 44) Turn ignition on. Measure voltage between ground and appropriate HO2S harness connector terminal No. 3 (Red/Black wire). (Scheme 33) 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 connector F32 terminal No. 6 (Red/Black wire). (Scheme 27) Check fuse No. 16 (10-amp) located in fuse block No. 1. Fuse block No. 1 is located under left side of instrument panel. Check for poor connection at fuse block No. 1 connector E201 terminal 5E. (Scheme 21) Check for open or short in Red/Black wire between HO2S and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Brown wire between ECM harness connector terminal No. 8 and left front HO2S harness connector terminal No. 2, or Green/Yellow wire between ECM harness connector terminal No. 9 and right front HO2S connector terminal No. 2. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
4. Measure resistance between HO2S terminals No. 2 and 3. (Scheme 67) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S tests as specified, go to next step. If HO2S does not test as specified, replace HO2S.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 33

Note. Before proceeding, ensure battery voltage is between 10.5 volts and 16 volts at idle.

1. Turn ignition on and select DATA MONITOR mode with CONSULT-II. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S41183697892003010800000) . 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 keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute. Turn ignition off and wait at least 10 seconds.
2. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute and at idle under no load. Let engine idle for one minute. Select MODE 3 with scan tool. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S41183697892003010800000) . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect appropriate rear HO2S harness connector. (Scheme 45) Turn ignition on. Measure voltage between ground and appropriate rear HO2S harness connector terminal No. 3 (Red/Black wire). If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Fuse No. 18 (10-amp) located in fuse block No. 1 under left side of instrument panel. Check for poor connection at fuse block No. 1 harness connector B1 terminal 7H (Red/Black wire). (Scheme 21) Check for poor connection at White, 20-pin connector E211 terminal No. 10 (Red/Black wire). (Scheme 34) For connector location (Scheme 28) Check for poor connection at Gray, 9-pin connector E305 terminal No. 6 (Red/Black wire). (Scheme 35) For connector location (Scheme 29) Check for open or short in Red/Black wire between appropriate rear HO2S and fuse. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Gray wire between ECM harness connector terminal No. 10 and left rear HO2S harness connector terminal No. 2, or Green wire between ECM harness connector terminal No. 11 and right rear HO2S harness connector terminal No. 2. (Scheme 20) Continuity should exist. 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 5.
4. Check the following: On left side, check for poor connection at connector E315 terminal No. 5 (Gray wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 3 (Green wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check for open or short between ECM and appropriate rear HO2S. Repair as necessary.
5. Turn ignition off. Measure resistance between appropriate HO2S terminals No. 2 and 3. (Scheme 67) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S tests as specified, go to next step. If HO2S does not test as specified, replace HO2S.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 34

Scheme 35

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. If engine will not start or stops soon, wait at least 10 seconds with engine stopped (ignition switch on) instead of running engine at idle speed.

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and warm to normal operating temperature. Run engine for at least 10 seconds at idle speed. 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" (Using CONSULT-II)

1. Start engine and warm to normal operating temperature. If engine cannot be started, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S41664331252004011200000) . Using CONSULT-II, select DATA MONITOR, and monitor MAS A/F SE-B1 voltage value. Increase engine speed to about 4000 RPM. If voltage increases linearly as engine speed increases, go to next step. If voltage does not increases linearly as engine speed increases, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S41664331252004011200000) .
2. Maintain the following conditions for at least 10 consecutive seconds: Engine speed more than 2000 RPM. THRTL SEN 1 value on scan tool more than 3 volts. THRTL SEN 2 value on scan tool more than 3 volts. Drive vehicle uphill (to increase engine load). If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S41664331252004011200000) . 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. Select MODE 1 with scan tool. Observe MAF reading on scan tool while increasing engine speed to 4000 RPM. If voltage does not increase linearly as engine speed increases, go to DIAGNOSTIC PROCEDURE . If voltage increases linearly as engine speed increases, system is okay at this time.

1. If malfunction "A" was duplicated, go to next step. If malfunction "B" was duplicated, inspect intake air duct and vacuum hoses for disconnection or leaks. If a problem is found, reconnect or repair as necessary. If no problems are found, go to next step.
2. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Disconnect MAF sensor harness connector. (Scheme 37) Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminals No. 2 (Blue wire) and No. 4 (Red wire). (Scheme 38) 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) harness connector F105 terminal 14T (Red wire). (Scheme 25)and (Scheme 27). Check for poor connection at fuse block No. 2 connector M143 terminal 2L (Red wire). Fuse block No. 2 is located under right side of instrument panel. Check open or short in Red wire between ECM relay connector terminal No. 6 and MAF sensor harness connector terminal No. 4. (Scheme 39) Check for open or short in Blue wire between MAF sensor harness connector terminal No. 2 and ECM harness connector terminal No. 103. see scheme 5and (Scheme 20). Repair as necessary.
4. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Light Green wire between MAF sensor harness connector terminal No. 3 and ECM harness connector terminal No. 109. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
5. Check continuity of Black/Yellow wire between MAF sensor harness connector terminal No. 1 and ECM harness connector terminal No. 91. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, 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. 91 (Black/Yellow wire) by backprobing, with engine at specified speeds. See «MAF SENSOR VOLTAGE»(ref-151807-S15110796712003010800000) 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 and repeat test. If voltage is still not as specified, remove MAF sensor and check hot film for damage or dust. Clean or replace MAF sensor as necessary.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

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.

Turn ignition on. Select DATA MONITOR with scan tool. Wait at least 6 seconds. 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" .

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and wait 5 seconds at most. 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 "C" .

Note. If 1st trip DTC is detected after 5 seconds, malfunction "C" may be present.

DTC Confirmation Test "C"

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and warm to normal operating temperature. Let engine idle for at least 10 seconds. 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 appropriate DTC CONFIRMATION TEST "D".

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

1. Turn ignition on. Start engine and warm to normal operating temperature. If engine starts, go to next step. If engine will not start, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S35166422732003010800000) .
2. Using scan tool, select DATA MONITOR, and monitor MAS A/F SE-B1 voltage value. Increase engine speed to about 4000 RPM. If voltage increases linearly as engine speed increases, go to next step. If voltage does not increases linearly as engine speed increases, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S35166422732003010800000) .
3. Maintain the following conditions for at least 10 consecutive seconds: Engine speed more than 2000 RPM. THRTL POS SEN value on scan tool more than 3 volts. Drive vehicle uphill (to increase engine load). If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S35166422732003010800000) . If 1st trip DTC is not detected, system is okay at this time.

DTC Confirmation Test "D" (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.

Turn ignition on. Start engine and warm to normal operating temperature. Select MODE 1 with scan tool. Observe MAF reading on scan tool while increasing engine speed to 4000 RPM. If voltage does not increase linearly as engine speed increases, go to DIAGNOSTIC PROCEDURE . If voltage increases linearly as engine speed increases, system is okay at this time.

1. If malfunction "A" or "C" was duplicated, go to next step. If malfunction "B" or "D"" was duplicated, inspect intake air duct and vacuum hoses for disconnection or leaks. If a problem is found, reconnect or repair as necessary. If no problems are found, go to next step.
2. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Disconnect MAF sensor harness connector. (Scheme 37) Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminals No. 2 (Blue wire) and No. 4 (Red wire). (Scheme 38) 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) harness connector F105 terminal 14T (Red wire). (Scheme 25)and (Scheme 27). Check for poor connection at fuse block No. 2 connector M143 terminal 2L (Red wire). Fuse block No. 2 is located under right side of instrument panel. Check open or short in Red wire between ECM relay connector terminal No. 6 and MAF sensor harness connector terminal No. 4. (Scheme 39) Check for open or short in Blue wire between MAF sensor harness connector terminal No. 2 and ECM harness connector terminal No. 103. see scheme 5and (Scheme 20). Repair as necessary.
4. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Light Green wire between MAF sensor harness connector terminal No. 3 and ECM harness connector terminal No. 109. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
5. Check continuity of Black/Yellow wire between MAF sensor harness connector terminal No. 1 and ECM harness connector terminal No. 91. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, 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. 91 (Black/Yellow wire) by backprobing, with engine at specified speeds. See «MAF SENSOR VOLTAGE»(ref-151807-S15110796712003010800000) 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 and repeat test. If voltage is still not as specified, remove MAF sensor and check hot film for damage or dust. Clean or replace MAF sensor as necessary.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

MAF SENSOR VOLTAGE

Scheme 36

Scheme 37

Scheme 38

Scheme 39

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 DTC Confirmation Test "B".

Turn ignition on. Select DATA MONITOR 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, turn ignition off, wait at least 10 seconds and go to DTC CONFIRMATION TEST "B" .

Ensure engine coolant temperature remains less than 194°F (90°C) for entire test. Turn ignition on. Select DATA MONITOR with scan tool. Start engine and drive vehicle at 43 MPH or more for 100 consecutive 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 MAF sensor harness connector. (Scheme 37) Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminal No. 5 (Blue wire). (Scheme 38) If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Blue wire between ECM and IAT sensor.
2. Turn ignition off. Check continuity between engine ground and MAF sensor harness connector terminal No. 3 (Light Green wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
3. Measure resistance between MAF sensor terminals No. 3 and 5. At 77°F (25°C), resistance should be 1900-2100 ohms. Also (Scheme 40) If resistance is as specified, go to next step. If resistance is not as specified, replace MAF sensor.
4. Turn ignition off. Disconnect joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check continuity between ground and shield circuit at connector F107 terminal No. 3 (Gray wire). Continuity should exist. Also, check for short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 40

Possible Causes (DTC P0117 Or P0118)

Malfunction is detected when ECM receives an excessively high or low voltage from ECT sensor. ECM will enter fail-safe mode. Possible causes are

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

Possible Causes (DTC P0125)

Malfunction is detected when voltage received from ECT sensor is incorrect based on engine run time, or engine coolant temperature is insufficient for closed loop fuel control. Possible causes are

1. High resistance in ECT sensor circuit.
2. Defective ECT sensor.
3. Stuck open thermostat.

1. If diagnosing for DTC P0117 or P0118, go to next step. If diagnosing for DTC P0125, go to step 6.
2. Turn ignition off. Disconnect ECT sensor harness connector. (Scheme 41) Turn ignition on. Measure voltage between ground and ECT sensor harness connector terminal No. 1 (White 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 connections at ECT sensor sub-harness connector. Check for open or short in White wire between ECT sensor harness connector and ECT sensor sub-harness connector. Check for open or short in Yellow/Black wire between ECT sensor sub-harness connector and ECM harness connector terminal No. 121. see scheme 5and (Scheme 20). Repair as necessary.
4. 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 circuit is okay, go to step 6.
5. Check the following: Check for poor connections at ECT sensor sub-harness connector. Check for open or short in Black wire between ECT sensor harness connector and ECM harness connector terminal No. 89. see scheme 5and (Scheme 20). Repair as necessary.
6. Remove ECT sensor. Place ECT sensor in heated water. Measure resistance between ECT sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE»(ref-151807-S36043263932003010800000) table. If resistance is not as specified, replace ECT sensor. If resistance is as specified, reconnect all harness connectors and go to next step.
7. If diagnosing for DTC P0117 or P0118, go to next step. If diagnosing for DTC P0125, allow engine to cool until coolant temperature is less than 158°F (70°C). Start engine and grasp lower radiator hose. If coolant is flowing through lower radiator hose, replace stuck open thermostat. If coolant is not flowing through lower radiator hose, go to next step.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Scheme 41

DTC Confirmation Test "A", "B" & "C"

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

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

Diagnostic Procedure "A", "B" & "C"

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Disconnect electronic throttle control actuator harness connector. (Scheme 42)
2. Turn ignition on. Measure voltage between ground and electronic throttle control actuator harness connector terminal No. 1 (Blue/White wire). (Scheme 43) If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between electronic throttle control actuator harness connector terminal No. 1 (Blue/White wire) and ECM harness connector terminal No. 103 (Blue wire). see scheme 5and (Scheme 20).
3. Turn ignition off. Check continuity between engine ground and electronic throttle control actuator harness connector terminal No. 5 (Blue wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 5
4. Check the following: Joint connector No. 30 (connector F108). (Scheme 27)and (Scheme 31). Check for open or short between electronic throttle control actuator harness connector terminal No. 5 (Blue wire) and ECM harness connector terminal No. 89 (Black wire). see scheme 5and (Scheme 20). Repair as necessary.
5. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check the following: Check continuity of White wire between electronic throttle control actuator harness connector terminal No. 2 and ECM harness connector terminal No. 98. Check continuity of Black/White wire between electronic throttle control actuator harness connector terminal No. 4 and ECM harness connector terminal No. 108. (Scheme 20) Continuity should exist. Also, check circuits for short to ground and short to voltage. If problem is found, repair circuit as necessary. If circuit is okay, go to next step.
6. Turn ignition off. Disconnect joint connector No. 28 (connector F106) and joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check the following shield circuits: Check continuity of Gray wire between joint connector No. 28 terminal No. 3 and joint connector No. 29 terminal No. 3. Check continuity of Gray wire between joint connector No. 28 terminals No. 1 and 3. Check continuity of Gray wire between joint connector No. 28 terminals No. 1 and 2. Check continuity between engine ground and joint connector No. 29 terminal No. 3 (Gray wire). Check joint connectors No. 28 and 29. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuits for short to voltage. If problem is found, repair as necessary. If circuits are okay, go to next step.
7. Reconnect all harness connectors. Perform throttle valve closed position learning procedure. See «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-151807-S22752529262003010800000) procedure under PROGRAMMING. Turn ignition on. Shift transmission into Drive. Measure voltage between ground and ECM terminals No. 98 (White wire) and No. 108 (Black/White wire) by backprobing, with accelerator pedal in specified positions. See «TP SENSOR VOLTAGE»(ref-151807-S37608975972003010800000) table. If voltage is as specified, go to next step. If voltage is not as specified, replace electronic throttle control actuator. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000).
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

TP SENSOR VOLTAGE

Scheme 42

Scheme 43

DTC Confirmation Test

Ensure engine coolant temperature remains less than 194°F (90°C) for entire test. Turn ignition on. Select DATA MONITOR with scan tool. Start engine and drive vehicle at 44 MPH or more for 100 consecutive 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 MAF sensor harness connector. (Scheme 37) Turn ignition on. Measure voltage between ground and MAF sensor harness connector terminal No. 5 (Blue wire). (Scheme 38) If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short in Blue wire between ECM and IAT sensor.
2. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity between MAF sensor harness connector terminal No. 3 (Light Green wire) and ECM harness connector terminal No. 109. (Scheme 20) Continuity should exist. Also, check circuit for short to ground or short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
3. Measure resistance between MAF sensor terminals No. 3 and 5. At 77°F (25°C), resistance should be 1900-2100 ohms. Also (Scheme 40) 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

1. Replace thermostat with new one. Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may come on.
2. Turn ignition on. Select COOLAN TEMP/S in DATA MONITOR mode with scan tool. Check that the COOLAN TEMP/S is above 140°F (60°C). If it is below 140°F (60°C), go to next step. If it is above 140°F (60°C), stop engine and cool down the engine to less than 140°F (60°C), then retest.
3. Drive vehicle for 10 consecutive minutes at speeds of 50-75 MPH. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S07127549562004011200000) . If 1st trip DTC is not detected, system is okay at this time.

Remove ECT sensor. Place ECT sensor in heated water. Measure resistance between ECT sensor terminals, with water at specified temperatures. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE table. If resistance is not as specified, replace ECT sensor. If resistance is as specified, check all harness connectors and repair as necessary.

1. 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.
3. Restart engine and let it idle for 25 seconds. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S28481602112003010800000) . 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.
2. Restart engine and let it idle for 25 seconds. Turn ignition off and wait at least 10 seconds.
3. Restart engine and let it idle for 25 seconds. Select MODE 3 with scan tool. If DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S28481602112003010800000) . If DTC is not detected, system is okay at this time.

1. Loosen and retighten appropriate front HO2S to 30-44 ft. lbs. (40-60 N.m). (Scheme 44) Turn ignition off. Disconnect appropriate HO2S harness connector. Check connectors for water. If water exists, repair or replace connectors as necessary. If water does not exist, go to next step.
2. Disconnect ECM harness connector. see scheme 5 Check continuity of Red/Blue wire between ECM harness connector terminal No. 114 and left front HO2S harness connector terminal No. 1, or Blue/White wire between ECM harness connector terminal No. 115 and right front HO2S harness connector terminal No. 1. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
3. 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 5.
4. Select MANU TRIG and adjust TRIGGER POINT to 100 percent 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 0.6 volt at least once. HO2S1 (B1)/(B2) voltage goes below 0.3 volt at least once. HO2S1 (B1)/(B2) voltage never exceeds one volt. If operation is as specified, go to step 6. If operation is not as specified, replace appropriate HO2S.
5. Measure voltage between ground and ECM terminal No. 114 (left front HO2S) or No. 115 (right front HO2S) by backprobing. see scheme 5and (Scheme 20). 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 HO2S.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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: 1350-2400 RPM. Vehicle speed: more than 50 MPH. B/FUEL SCHDL: 1.6-12.0 msec. If TESTING is not displayed after 5 minutes, retry from step 2 .
7. Press SELF-DIAG RESULTS. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S14995629162003010800000) . 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. Measure voltage between ground and left front HO2S signal circuit (Red/Blue wire) at ECM terminal No. 114 (DTC P0133), or right front HO2S signal circuit (Blue/White wire) at ECM terminal No. 115 (DTC P0153) by backprobing. see scheme 5and (Scheme 20).
2. 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 «DIAGNOSTIC PROCEDURE»(ref-151807-S00970706162003010800000). If voltage is as specified, system is okay at this time.

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Loosen and retighten front HO2S to 30-44 ft. lbs. (40-60 N.m). Start engine and check exhaust and intake systems for leaks. If problem is found, repair as necessary. If problem is not found, warm engine to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Run engine for at least 10 minutes at idle speed. If 1st trip DTC P0171, P0172, P0174 or P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0171, P0172, P0174 or P0175. See «DTC P0171 OR P0174: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (LEAN)»(ref-151807-S14911151182003010800000) or «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0171, P0172, P0174 or 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 37) Start engine and let it idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector. Turn ignition on and ensure 1st trip DTC P0102, P0103 or P1102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. Retrieve DTCs. If 1st trip DTC P0171, P0172, P0174 or P0175 is set and engine is hard to start, perform diagnosis for DTC P0171, P0172, P0174 or P0175. See «DTC P0171 OR P0174: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (LEAN)»(ref-151807-S14911151182003010800000) or «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0171, P0172, P0174 or P0175 is not set and engine is not hard to start, go to next step.
4. Turn ignition off. Disconnect ECM and appropriate HO2S harness connectors. see scheme 5and (Scheme 44). Check continuity of Red/Blue wire between ECM harness connector terminal No. 114 and left front HO2S harness connector terminal No. 1, or Blue/White wire between ECM harness connector terminal No. 115 and right front HO2S harness connector terminal No. 1. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
5. Measure resistance between HO2S terminals No. 2 and 3. (Scheme 67) Resistance should be 2.3-4.3 ohms at 77°F (25°C). Check continuity between HO2S terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S tests as specified, go to next step. If HO2S does not test as specified, replace HO2S.
6. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Measure voltage between ground and ECM terminal No. 91 (Black/Yellow wire) by backprobing, with engine at specified speeds. See «MAF SENSOR VOLTAGE»(ref-151807-S12600481882003010800000) 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 and repeat test. If voltage is still not as specified, remove MAF sensor and check hot film for damage or dust. Clean or replace MAF sensor as necessary.
8. 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.
9. Reconnect all harness connectors and hoses. Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 11.
10. Select MANU TRIG and adjust TRIGGER POINT to 100 percent 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 0.6 volt at least once. HO2S1 (B1)/(B2) voltage goes below 0.3 volt at least once. HO2S1 (B1)/(B2) voltage never exceeds one volt. If operation is as specified, go to step 12. If operation is not as specified, replace appropriate HO2S.
11. Measure voltage between ground and ECM terminal No. 114 (left front HO2S) or No. 115 (right front HO2S) 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 appropriate HO2S.
12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

MAF SENSOR VOLTAGE

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.
5. When the following conditions are met, TESTING will be displayed on CONSULT-II screen: ENG SPEED: 1100-3600 RPM. Vehicle speed: more than 40 MPH. B/FUEL SCHDL: 1.6-12.0 msec. 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 «DIAGNOSTIC PROCEDURE»(ref-151807-S19917208202003010800000) . 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.

Start engine and warm to normal operating temperature. Measure voltage between ground and left front HO2S signal circuit (Red/Blue wire) at ECM terminal No. 114 (DTC P0134), or right front HO2S signal circuit (Blue/White wire) at ECM terminal No. 115 (DTC P0154) by backprobing. see scheme 5and (Scheme 20). While observing voltmeter, increase engine speed to 2000 RPM. If voltage remains in the.2-.4 volt range, go to DIAGNOSTIC PROCEDURE. If voltage does not remain in the.2-.4 volt range, system is okay at this time.

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Disconnect appropriate front HO2S harness connector. (Scheme 44) Check continuity between ground and appropriate front HO2S harness connector terminal No. 4 (Black/White wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
2. Disconnect ECM harness connector. see scheme 5 Check continuity of Red/Blue wire between ECM harness connector terminal No. 114 and left front HO2S harness connector terminal No. 1, or Blue/White wire between ECM harness connector terminal No. 115 and right front HO2S harness connector terminal No. 1. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
3. 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 5.
4. Select MANU TRIG and adjust TRIGGER POINT to 100 percent 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 0.6 volt at least once. HO2S1 (B1)/(B2) voltage goes below 0.3 volt at least once. HO2S1 (B1)/(B2) voltage never exceeds one volt. If operation is as specified, go to step 6. If operation is not as specified, replace appropriate HO2S.
5. Measure voltage between ground and ECM terminal No. 114 (left front HO2S) or No. 115 (right front HO2S) 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 appropriate HO2S.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 44

1. Turn ignition on and select DATA MONITOR mode with CONSULT-II. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for 2 minutes.
3. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S36963855842003010800000) . 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 keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute.
2. Turn ignition off and wait at least 10 seconds. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for 2 minutes. Select MODE 3 on scan tool.
3. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S36963855842003010800000) . If 1st trip DTC is not detected, system is okay at this time.

Scheme 45

Scheme 46

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Run engine for at least 10 minutes at idle speed. If 1st trip DTC P0172 or P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0172 or P0175. See «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0172 or 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 37) Start engine and let it idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector. Turn ignition on and ensure 1st trip DTC P0102, P0103 or P1102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. Retrieve DTCs. If 1st trip DTC P0172 or P0175 is set and engine is hard to start, perform diagnosis for DTC P0172 or P0175. See «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0172 or P0175 is not set and engine is not hard to start, go to next step.
4. Turn ignition off. Disconnect appropriate rear HO2S harness connector. (Scheme 45) Check continuity between engine ground and appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6.
5. Check the following: On left side, check for poor connection at connector E315 terminal No. 10 (Black/Red wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 2 (White wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check for open or short to voltage between appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side) and ground. Repair as necessary.
6. Disconnect ECM harness connector. see scheme 5 Check continuity between left rear HO2S harness connector terminal No. 1 (Brown wire) and ECM harness connector terminal No. 123 (Purple wire), or check continuity of Black wire between right rear HO2S harness connector terminal No. 1 and ECM harness connector terminal No. 124. (Scheme 20) Continuity should exist. 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 8.
7. Check the following: On left side, check for poor connection at connector E315 terminal No. 4 (Brown wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 8 (Black wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check for open or short between rear HO2S2 and ECM. Repair as necessary.
8. 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 using generic scan tool, go to step 10.
9. Select FUEL INJECTION in ACTIVE TEST mode with CONSULT-II. Select HO2S2 (B1)/(B2) as the monitor item. Observe HO2S2 (B1)/(B2) reading while adjusting FUEL INJECTION to +25 percent and -25 percent. HO2S2 (B1)/(B2) reading should be more than.62 volt when FUEL INJECTION is +25 percent. HO2S2 (B1)/(B2) reading should be less than.48 volt when FUEL INJECTION is -25 percent. If operation is as specified, go to step 12. If operation is not as specified, replace malfunctioning HO2S.
10. Measure voltage between ground and left rear HO2S signal circuit at ECM terminal No. 123 (Purple wire) or right rear HO2S signal circuit at ECM terminal No. 124 (Black wire) by backprobing. While monitoring voltmeter, quickly increase engine speed to 4000 RPM and release accelerator pedal. Repeat 10 times. Voltage should be more than.62 volt at least once during this procedure. If voltage is as specified, go to step 12. If voltage is not as specified, go to next step.
11. Allow engine to idle for 10 minutes, then recheck voltage. Or, check voltage when coasting from 50 MPH in Drive with Overdrive turned off. Voltage should be less than.48 volt at least once during this procedure. If voltage is as specified, go to next step. If voltage is not as specified, replace malfunctioning HO2S2.
12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition on and select DATA MONITOR mode with CONSULT-II. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute.
3. Ensure COOLAN TEMP/S indicates more than 158°F (70°C). Select HO2S2 (B1) P0139 or HO2S2 (B2) P0159 of HO2S2 in DTC WORK SUPPORT mode with CONSULT-II.
4. Start engine. Follow instructions on CONSULT-II screen. Press SELF-DIAG RESULTS. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S30987865982003010800000) . If OK is displayed, system is okay at this time. If CANNOT BE DIAGNOSED is displayed, go to next step.
5. Turn ignition off and leave the vehicle in a cool place (soak the vehicle). Return to step 1 .

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

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute.
2. Measure voltage between ground and left rear HO2S signal circuit at ECM terminal No. 123 (Purple wire) or right rear HO2S signal circuit at ECM terminal No. 124 (Black wire) by backprobing. see scheme 5and (Scheme 20).
3. While monitoring voltmeter, quickly increase engine speed to 4000 RPM and release accelerator pedal. Repeat 10 times. Voltage should change at a rate of more than.06 volt in one second during this procedure. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to next step.
4. Keep vehicle idling for 10 minutes, then check the voltage. Or, check the voltage when coasting from 50 MPH in "D" position. If voltage is as specified, system is okay at this time. If voltage is still not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S30987865982003010800000).

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Run engine for at least 10 minutes at idle speed. If 1st trip DTC P0172 or P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0172 or P0175. See «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0172 or 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 37) Start engine and let it idle for at least 5 seconds. Turn ignition off and reconnect MAF sensor harness connector. Turn ignition on and ensure 1st trip DTC P0102, P0103 or P1102 is set. Clear DTCs. Start engine and let it idle for at least 10 minutes. Retrieve DTCs. If 1st trip DTC P0172 or P0175 is set and engine is hard to start, perform diagnosis for DTC P0172 or P0175. See «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0172 or P0175 is not set and engine is not hard to start, go to next step.
4. Turn ignition off. Disconnect appropriate rear HO2S harness connector. (Scheme 45) Check continuity between engine ground and appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 6.
5. Check the following: On left side, check for poor connection at connector E315 terminal No. 10 (Black/Red wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 2 (White wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check for open or short to voltage between appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side) and ground. Repair as necessary.
6. Disconnect ECM harness connector. see scheme 5 Check continuity between left rear HO2S harness connector terminal No. 1 (Brown wire) and ECM harness connector terminal No. 123 (Purple wire), or check continuity of Black wire between right rear HO2S harness connector terminal No. 1 and ECM harness connector terminal No. 124. (Scheme 20) Continuity should exist. 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 8.
7. Check the following: On left side, check for poor connection at connector E315 terminal No. 4 (Brown wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 8 (Black wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check for open or short between rear HO2S2 and ECM. Repair as necessary.
8. 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 using generic scan tool, go to step 10.
9. Select FUEL INJECTION in ACTIVE TEST mode with CONSULT-II. Select HO2S2 (B1)/(B2) as the monitor item. Observe HO2S2 (B1)/(B2) reading while adjusting FUEL INJECTION to +25 percent and -25 percent. HO2S2 (B1)/(B2) reading should be more than.62 volt when FUEL INJECTION is +25 percent. HO2S2 (B1)/(B2) reading should be less than.48 volt when FUEL INJECTION is -25 percent. If operation is as specified, go to step 12. If operation is not as specified, replace malfunctioning HO2S.
10. Measure voltage between ground and left rear HO2S signal circuit at ECM terminal No. 123 (Purple wire) or right rear HO2S signal circuit at ECM terminal No. 124 (Black wire) by backprobing. While monitoring voltmeter, quickly increase engine speed to 4000 RPM and release accelerator pedal. Repeat 10 times. Voltage should be more than.62 volt at least once during this procedure. If voltage is as specified, go to step 12. If voltage is not as specified, go to next step.
11. Allow engine to idle for 10 minutes, then recheck voltage. Or, check voltage when coasting from 50 MPH in Drive with Overdrive turned off. Voltage should be less than.48 volt at least once during this procedure. If voltage is as specified, go to next step. If voltage is not as specified, replace malfunctioning HO2S2.
12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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 P0171 or P0174 is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S26207380602003010800000) . If 1st trip DTC P0171 or P0174 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 «DIAGNOSTIC PROCEDURE»(ref-151807-S26207380602003010800000) . If engine does not start, visually check for intake and exhaust leaks.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Disconnect MAF sensor harness connector. (Scheme 37) 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 1st trip DTC P0102, P0103 or P1102 is detected. Select MODE 4 and erase 1st trip DTC. Start engine and let it idle for at least 10 minutes. Select MODE 7. If 1st trip DTC P0171 or P0174 is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S26207380602003010800000). If 1st trip DTC P0171 or P0174 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 «DIAGNOSTIC PROCEDURE»(ref-151807-S26207380602003010800000). If engine does not start, visually check for intake and exhaust leaks.

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 detected, repair or replace as necessary. If no leaks are detected, go to next step.
2. Turn ignition off. Disconnect appropriate front HO2S and ECM harness connectors. see scheme 5and (Scheme 44). Check continuity of Red/Blue wire between ECM harness connector terminal No. 114 and left front HO2S harness connector terminal No. 1, or Blue/White wire between ECM harness connector terminal No. 115 and right front HO2S harness connector terminal No. 1. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
3. Check fuel pressure at idle. See BASIC DIAGNOSTIC PROCEDURES article. Fuel pressure should be 51 psi (350 kPa). If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, check fuel pump, fuel pressure regulator, fuel lines and fuel filter. See «FUEL SYSTEM»(ref-151810-S29003858602003010800000) in SYSTEM & COMPONENT TESTING article. Repair 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 3.8-5.2 g/sec at idle and 16.0-21.5 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 P0102, P0103 OR P1102: MASS AIRFLOW SENSOR»(ref-151807-S12823032842003010800000).
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-151810-S29003858602003010800000) in SYSTEM & COMPONENT TESTING article.
6. Turn ignition off and allow engine to cool. Ensure no fire hazards exist and remove injector assembly with fuel lines and harness connectors connected. Place a suitable cup under each injector to collect fuel. Disconnect all ignition coil harness connectors. Crank engine for 3 seconds and ensure each injector sprays fuel. Replace injectors that do not spray fuel. If all injectors are okay, go to next step.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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 P0172 or P0175 is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S18993300412003010800000) . If 1st trip DTC P0172 or P0175 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 «DIAGNOSTIC PROCEDURE»(ref-151807-S18993300412003010800000) . If engine does not start, remove spark plugs and check for 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 37) 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 1st trip DTC P0102, P0103 or P1102 is detected. Select MODE 4 and erase 1st trip DTC. Start engine and let it idle for at least 10 minutes. Select MODE 7. If 1st trip DTC P0172 or P0175 is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S18993300412003010800000). If 1st trip DTC P0172 or P0175 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 «DIAGNOSTIC PROCEDURE»(ref-151807-S18993300412003010800000). If engine does not start, remove spark plugs and check for 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 detected, repair or replace as necessary. If no leaks are detected, go to next step.
2. Turn ignition off. Disconnect appropriate front HO2S and ECM harness connectors. see scheme 5and (Scheme 44). Check continuity of Red/Blue wire between ECM harness connector terminal No. 114 and left front HO2S harness connector terminal No. 1, or Blue/White wire between ECM harness connector terminal No. 115 and right front HO2S harness connector terminal No. 1. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
3. Check fuel pressure at idle. See BASIC DIAGNOSTIC PROCEDURES article. Fuel pressure should be 51 psi (350 kPa). If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, check fuel pump, fuel pressure regulator, fuel lines and fuel filter. See «FUEL SYSTEM»(ref-151810-S29003858602003010800000) in SYSTEM & COMPONENT TESTING article. Repair 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 3.8-5.2 g/sec at idle and 16.0-21.5 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 P0102, P0103 OR P1102: MASS AIRFLOW SENSOR»(ref-151807-S12823032842003010800000).
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-151810-S29003858602003010800000) in SYSTEM & COMPONENT TESTING article.
6. Turn ignition off and allow engine to cool. Ensure no fire hazards exist and remove injector assembly with fuel lines and harness connectors connected. Place a suitable cup under each injector to collect fuel. Disconnect all ignition coil harness connectors. Crank engine for 3 seconds. Ensure fuel does not drip from injectors. Replace injectors which are dripping. If all injectors are okay, go to next step.
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on. Select DATA MONITOR 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, check COOLAN TEMP/S reading with scan tool. If reading is 140°F (60°C) or more, allow engine to cool until engine coolant temperature is less than 140°F (60°C). Wait at least 10 seconds. If 1st trip DTC is still not detected, system is okay at this time.

1. Turn ignition off. Remove trim from trunk, and disconnect fuel level/FTT sensor harness connector located on top of fuel tank. Turn ignition on. Measure voltage between ground and FTT sensor harness connector terminal No. 4 (Purple/White wire). (Scheme 47) 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 Super Multiple Junction (SMJ) harness connector F105 terminal 26T (Purple/White wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 50V (Purple/White wire). (Scheme 26)and (Scheme 30). Check for open or short in Purple/White wire between FTT sensor and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between body ground and FTT sensor harness connector terminal No. 2 (Black/Orange wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 5.
4. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 7T (Black/Orange wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 11V (Black/Orange wire). (Scheme 26)and (Scheme 30). Joint connector No. 30 (connector F108). (Scheme 27)and (Scheme 31). Check for open or short in Black/Orange wire between FTT sensor and ECM. Repair as necessary.
5. Remove FTT sensor. Measure resistance between sensor terminals No. 2 and 4, with sensor at specified temperatures. See «FUEL TANK TEMPERATURE SENSOR RESISTANCE»(ref-151807-S29599235472003010800000) table. 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

FUEL TANK TEMPERATURE SENSOR RESISTANCE

Scheme 47

Turn ignition on. Select DATA MONITOR 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 speed 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 a problem is found, repair as necessary. If no problems are 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 5. If all cylinders produce a momentary engine speed drop, go to step 8.
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 next step. If all cylinders produce a momentary engine speed drop, go to step 8.
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-151810-S29003858602003010800000) in SYSTEM & COMPONENT TESTING article.
6. Turn ignition off. Disconnect spark plug wire from spark plug. Connect a known good spark plug to spark plug wire. 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 appropriate IGNITION COIL & POWER TRANSISTOR procedure under «IGNITION SIGNAL»(ref-151810-S09752809322003120100000) under IGNITION SYSTEM 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-151802) article. See «COMPRESSION SPECIFICATIONS»(ref-151807-S35759567902003010800000) 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-151802) 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-151810-S29003858602003010800000) in SYSTEM & COMPONENT TESTING article.
10. Check target idle speed and ignition timing. See «ON-VEHICLE ADJUSTMENTS»(ref-151800) 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 in ON-VEHICLE ADJUSTMENTS 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 adjust TRIGGER POINT to 100 percent 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 0.6 volt at least once. HO2S1 (B1)/(B2) voltage goes below 0.3 volt at least once. HO2S1 (B1)/(B2) voltage never exceeds one volt. If operation is as specified, go to step 14. If operation is not as specified, replace appropriate HO2S.
13. Measure voltage between ground and ECM terminal No. 114 (left front HO2S) or No. 115 (right front HO2S) by backprobing. see scheme 5and (Scheme 20). 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 HO2S.
14. Select MODE 1 with scan tool, and read Mass Airflow (MAF) sensor signal. MAF sensor reading should be 3.8-5.2 grams per second at idle and 16.0-21.5 grams per second at 2500 RPM. If MAF sensor reading is as specified, go to step 16. If MAF sensor 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, P0103 OR P1102: MASS AIRFLOW SENSOR»(ref-151807-S12823032842003010800000). Repair as necessary.
16. Check for possible causes of rough idle. See ROUGH IDLE 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

COMPRESSION SPECIFICATIONS

Turn ignition on. Select DATA MONITOR with scan tool. 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. Disconnect ECM harness connector. see scheme 5 For bank No. 1, measure resistance between engine ground and ECM harness connector terminal No. 125 (White wire). For bank No. 2, measure resistance between engine ground and ECM harness connector terminal No. 126 (White wire). (Scheme 20) Resistance should be 530-590 k/ohms at 68°F (20°C). Also, check White wire 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.
2. Disconnect appropriate knock sensor harness connector. (Scheme 48) Check continuity of White wire between left knock sensor harness connector terminal No. 1 and ECM harness connector terminal No. 125, or between right knock sensor harness connector terminal No. 1 and ECM harness connector terminal No. 126. Continuity should exist. 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 4.
3. Check the following: Check for poor connections at Dark Gray, 4-pin connector F40. For location (Scheme 27) Check for open or short between knock sensor and ECM. Repair as necessary.
4. Measure resistance between ground and knock sensor terminal No. 1 (component side). 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. CAUTION: Replace knock sensor if it has been dropped or physically damaged.
5. Loosen and retighten 2 engine ground bolts. (Scheme 36) Disconnect Dark Gray, 4-pin connector F40. For location (Scheme 27) Check continuity between engine ground and shield circuit at connector F40 terminals No. 1 (bank No. 1) or No. 3 (bank No. 2). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 48

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and let it idle for at least 5 seconds, or crank engine for 2 seconds if engine will not start. 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 36) Disconnect CKP sensor (POS) harness connector. (Scheme 49) Turn ignition on. Measure voltage between ground and CKP sensor (POS) harness connector terminal No. 3 (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 Gray, 9-pin connector E35 terminal No. 2 (Light Green wire). (Scheme 35) For connector location (Scheme 29) Check for poor connection at Gray, 10-pin connector F33 terminal No. 5 (Red wire). (Scheme 46) For connector location (Scheme 27) Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 14T (Red wire). (Scheme 25)and (Scheme 27). Check for open or short in Red wire between ECM relay, ECM and CKP sensor (POS). Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and CKP sensor harness connector terminal No. 1 (Black/White wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 5.
4. Check the following: Check for poor connection at Gray, 9-pin connector E35 terminal No. 3 (Black/White wire). (Scheme 35) For connector location (Scheme 29) Check for poor connection at Gray, 10-pin connector F33 terminal No. 8 (Black wire). (Scheme 46) For connector location (Scheme 27) Check joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). 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 Pink/Blue wire between CKP sensor (POS) harness connector terminal No. 2 and ECM harness connector terminal No. 63. (Scheme 20) Continuity should exist. 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 Gray, 9-pin connector E35 terminal No. 7 (Blue wire). (Scheme 35) For connector location (Scheme 29) Check for poor connection at Gray, 10-pin connector F33 terminal No. 4 (Pink/Blue wire). (Scheme 46) For connector location (Scheme 27) Check for open or short between CKP sensor (POS) and ECM. Repair as necessary.
7. Remove CKP sensor (POS). Visually inspect sensor for chipping. Measure resistance between sensor terminals as shown in illustration. (Scheme 50) Replace sensor if it is chipped or if resistance is not as specified. If sensor is okay, go to next step.
8. Disconnect Gray, 9-pin connector E35 from connector E305. (Scheme 29) Check continuity between engine ground and shield circuit at connector E35 terminal No. 8. (Scheme 35) Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 10.
9. Check the following: Connectors E35 and E305. Connectors F33 and E33. Check joint connector No. 28 (connector F106) and No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check for open or short between connector E35 and engine ground. Repair as necessary.
10. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 49

Scheme 50

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and let it idle for at least 5 seconds, or crank engine for at least 2 seconds if engine will not start. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Attempt to start engine. If engine does not crank, repair starting system. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS. If engine cranks, go to next step.
2. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Disconnect CMP sensor harness connector. (Scheme 52) Turn ignition on. Measure voltage between ground and CMP sensor harness connector terminal No. 3 (Red 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) harness connector F105 terminal 14T (Red wire). (Scheme 25)and (Scheme 27). Check for open or short in Red wire between CMP sensor, ECM and ECM relay. Repair as necessary.
4. Turn ignition off. 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, go to next step. If circuit is okay, go to step 6.
5. Check the following: Check joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check for open or short between engine ground and CMP sensor. Repair as necessary.
6. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Blue/White wire between CMP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 84. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
7. Remove CMP sensor. Visually inspect sensor for chipping. Measure resistance between sensor terminals as shown in illustration. (Scheme 51) Replace sensor if it is chipped or if resistance is not as specified. If sensor is okay, go to next step.
8. Disconnect joint connector No. 28 (connector F106). (Scheme 27)and (Scheme 31). Check the following: Check continuity between ground and joint connector No. 28 terminal No. 3 (Gray wire). Continuity should exist. Check for poor connections at joint connector No. 28 (connector F106) and No. 29 (connector F107). If problem is found, repair as necessary. If problem is not found, go to next step.
9. Inspect camshaft sprocket for damage. Replace, if necessary. If camshaft sprocket is okay, no problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 51

Scheme 52

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

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed between 3500-4000 RPM for one minute under no load. Let engine idle for one minute. Open vehicle hood.
2. Select DTC & SRT CONFIRMATION then SRT WORK SUPPORT mode with CONSULT-II. Hold engine speed at 2000-3000 RPM for 3 consecutive minutes. Release accelerator pedal completely.
3. 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).
4. If CMPLT is not displayed, stop engine and cool to less than 158°F (70°C). Turn ignition on. Select COOLAN TEMP/S in DATA MONITOR mode with CONSULT-II. Start engine and warm up while monitoring COOLAN TEMP/S on CONSULT-II. When COOLAN TEMP/S indication reaches 158°F (70°C), go to next step.
5. Select SELF-DIAG RESULTS mode with CONSULT-II. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S16790523492003010800000) . If 1st trip DTC is not detected, system is okay at this time.

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

1. Start engine and warm to the normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep the engine speed between 3500-4000 RPM for one minute under no load. Let engine idle for one minute. Measure voltage between engine ground and left front HO2S signal circuit at ECM terminal No. 114 (Red/Blue wire), or right front HO2S signal circuit at ECM terminal No. 115 (Blue/White wire), by backprobing. Also, measure voltage between ground and left rear HO2S signal circuit at ECM terminal No. 123 (Purple wire), or right rear HO2S signal circuit at ECM terminal No. 124 (Black wire), by backprobing. see scheme 5and (Scheme 20).
2. Increase engine speed to 2000 RPM and keep constant under no load. If switching frequency of rear HO2S is less than 75 percent of front HO2S switching frequency, catalyst is operating correctly. If switching frequency of rear HO2S is not less than 75 percent of front HO2S switching frequency, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S16790523492003010800000). If front HO2S does not switch more than 5 times within 10 seconds, diagnose and repair front HO2S. See «DTC P0133 OR P0153: BANK 1 OR BANK 2 HO2S1 (RESPONSE MONITORING)»(ref-151807-S00957082242003010800000).

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-151800) 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 article.
3. Turn engine off. Turn ignition on. Measure voltage between ground and ECM terminals No. 5 (Black/White wire), No. 6 (Blue wire), No. 7 (Brown wire), No. 13 (Pink wire), No. 14 (Orange/Blue wire), No. 15 (Black/Red wire), No. 16 (Orange wire) and No. 17 (Green wire) by backprobing. 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 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 appropriate IGNITION COIL & POWER TRANSISTOR procedure under «IGNITION SIGNAL»(ref-151810-S09752809322003120100000) under IGNITION SYSTEM in SYSTEM & COMPONENT TESTING 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

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 at least 70 seconds. Select "PURG FLOW P0441" of "EVAPORATIVE SYSTEM" in "DTC CONFIRMATION" mode with CONSULT-II. Touch "START".
2. If "COMPLETED" is displayed, go to next step. When the following conditions are met, "TESTING" will be displayed on the CONSULT-II screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". It will take at least 35 seconds. Vehicle speed: 20-75 MPH. ENG SPEED: 500-3800 RPM. B/FUEL SCHDL: 1.0 - 10.0 msec. Engine coolant temperature: 158-212°F (70-100°C). If "TESTING" is not changed for a long time, perform retest.
3. Ensure that "OK" is displayed after touching "SELF-DIAG RESULTS". If "NG" is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S28432693872004011200000) .

Note. Use this procedure to check the overall monitoring function of the EVAP control system purge flow monitoring. During this check, a DTC might not be confirmed.

1. Lift up drive wheels. Start engine (VDC switch "OFF") and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and wait at least 70 seconds. Set voltmeter probes to ECM terminal No. 110 (Green wire) (EVAP control system pressure sensor signal) and ground.
2. Check EVAP control system pressure sensor value at idle speed and note it. Establish and maintain the following conditions for at least one minute: Air conditioner switch: ON. Headlamp switch: ON. Rear window defogger switch: ON. Engine speed: About 3000 RPM. Gear position: Any position other than "P", "N" or "R". Verify that EVAP control system pressure sensor value stays 0.1 volt less than the value at idle speed (measured previously) for at least one second. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S28432693872004011200000) .

Scheme 53

1. Inspect EVAP canister for cracks. (Scheme 55) Replace, if cracked. If EVAP canister is not cracked, go to next step.
2. If using CONSULT-II, go to next step. If using generic scan tool, go to step 4.
3. Disconnect vacuum hose connected to EVAP-CPVCV at EVAP service port. (Scheme 54) 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. While observing vacuum gauge, press "Qd" and "Qu" on CONSULT-II screen to adjust PURG VOL CONT/V opening. Vacuum should exist when PURG VOL CONT/V opening is 100 percent. Vacuum should not exist when PURG VOL CONT/V opening is zero percent. If operation is as specified, go to step 8. If operation 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-CPVCV at EVAP service port. (Scheme 54) Connect vacuum gauge to disconnected hose. Start engine and let it idle for at least 80 seconds. While observing vacuum gauge, increase engine speed to 2000 RPM. Vacuum should exist. Release throttle. Vacuum should not exist. If operation is as specified, go to step 9. If operation is not as specified, go to next step.
5. Turn ignition off. Check EVAP purge line for blockage or improper connections. Also, check intake manifold purge port for blockage. If a problem is found, repair as necessary. If no problem is found, go to next step.
6. Disconnect purge hoses connected to EVAP service port and EVAP canister purge volume control solenoid valve. Blow air into each hose and EVAP purge port. Ensure air flows freely. If air flows freely using CONSULT-II, go to next. If air flows freely using generic scan tool, go to step 9. If air does not flow freely, repair or clean hoses and/or purge port.
7. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Check that engine speed varies according to the valve opening. If engine speed is correct, go to step 10. If engine speed is not correct, go to next step.
8. Disconnect hoses from EVAP-CPVCV. (Scheme 53) Command PURG VOL CONT/V to 100 percent with CONSULT-II. Air should flow between EVAP-CPVCV ports "A" and "B". Command PURG VOL CONT/V to zero percent. Air should not flow between EVAP-CPVCV ports "A" and "B". If operation is as specified, go to step 10. If operation is not as specified, replace EVAP-CPVCV.
9. Turn ignition off. Remove EVAP-CPVCV. (Scheme 53) Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. (Scheme 57) 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-CPVCV.
10. 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.
11. Check EVAP-CSPS function. See appropriate DTC CONFIRMATION TEST under «DTC P0452: EVAP CONTROL SYSTEM PRESSURE SENSOR (LOW VOLTAGE)»(ref-151807-S35188560322004011200000) or «DTC P0453: EVAP CONTROL SYSTEM PRESSURE SENSOR (HIGH VOLTAGE)»(ref-151807-S30038107392004011200000). If 1st trip DTC is detected, replace EVAP-CSPS. If 1st trip DTC is not detected, go to next step.
12. Disconnect hose connected to EVAP-CVCV. 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 59) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
13. Check EVAP purge line for evidence of leaks. If a leak is found, repair as necessary. If no leak is found, clean EVAP purge line with compressed air. Go to next step.
14. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Possible Causes (DTC P0442)

Malfunction is detected when EVAP system has a leak or does not operate properly. Possible causes are

1. Incorrect fuel tank vacuum relief valve.
2. Incorrect fuel filler cap.
3. Fuel filler cap open or leaking.
4. Foreign matter in fuel filler cap.
5. Leak in hose between intake manifold and EVAP Canister Purge Volume Control Valve (EVAP-CPVCV).
6. Foreign matter in EVAP Canister Vent Control Valve (EVAP-CVCV).
7. Leak in EVAP canister or fuel tank.
8. Leak or blockage in EVAP purge line.
9. Leak or blockage in hose to EVAP Control System Pressure Sensor (EVAP-CSPS).
10. Defective EVAP-CVCV or circuit.
11. Defective EVAP-CPVCV or circuit.
12. Defective fuel tank temperature sensor.
13. Missing or damaged EVAP-CVCV "O" ring.
14. Defective water separator.
15. EVAP canister saturated with water.
16. Defective EVAP-CSPS.
17. Defective fuel level sensor or circuit.
18. Defective refueling control valve.
19. Leak in On-Board Refueling Vapor Recovery (ORVR) system.

Possible Causes (DTC P0455 Or P1442)

Malfunction is detected when EVAP system has a very large leak such as fuel filler cap missing, or EVAP system does not operate properly. Possible causes are

1. Fuel filler cap remains open or fails to close.
2. Incorrect fuel tank vacuum relief valve.
3. Incorrect fuel filler cap.
4. Foreign matter in fuel filler cap.
5. Leak in hose between intake manifold and EVAP Canister Purge Volume Control Valve (EVAP-CPVCV).
6. Foreign matter in EVAP Canister Vent Control Valve (EVAP-CVCV).
7. Leak in EVAP canister or fuel tank.
8. Leak or blockage in EVAP purge line.
9. Leak or blockage in hose to EVAP Control System Pressure Sensor (EVAP-CSPS).
10. Defective EVAP-CVCV or circuit.
11. Defective EVAP-CPVCV or circuit.
12. Defective fuel tank temperature sensor.
13. Missing or damaged EVAP-CVCV "O" ring.
14. Defective EVAP-CSPS.
15. Defective refueling control valve.
16. Leak in On-Board Refueling Vapor Recovery (ORVR) system.

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

1. Tighten fuel filler cap until ratcheting sound is heard (for DTC P0455 or P1442). 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) for DTC P0442, or 32-140°F (0-60°C) for DTC P0455 or P1442.
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-151800) article.
4. If OK is displayed on CONSULT-II, system is okay at this time. If NG is displayed, select SELF-DIAG RESULTS with CONSULT-II. If DTC P0442 is displayed, go to «DIAGNOSTIC PROCEDURE (DTC P0442)»(ref-151807-S41666432992003010800000) . If DTC P0455 OR P1442 is displayed, go to «DIAGNOSTIC PROCEDURE (DTC P0455 OR P1442)»(ref-151807-S07241478692003010800000) .

Note. Before performing test, ensure fuel tank level is 1/4-3/4, ambient temperature is 32-86°F (0-32°C) and EVAP-CPVCV 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-151807-S06702442472003010800000) 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, P0455 or P1442 is set, perform appropriate diagnostic procedure. If DTC P0442, P0455 or P1442 is not set, go to step 2 .

Diagnostic Procedure (DTC P0442)

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 retest system.
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 and retest system.
4. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 54) 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-151813) 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 55) Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. 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-151813) 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 56) 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 appropriate DTC CONFIRMATION TEST under «DTC P1448: EVAP CANISTER VENT CONTROL VALVE (OPEN)»(ref-151807-S04172837442003010800000). 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 13. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.6 lbs. (2.1 kg), go to next step. If weight is less than 4.6 lbs. (2.1 kg), go to step 13.
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-CPVCV 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-CPVCV 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-CPVCV 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-151813) 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, replace EVAP-CPVCV.
17. Turn ignition off. Remove EVAP-CPVCV. Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. (Scheme 57) 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-CPVCV.
18. Remove FTT sensor. Measure resistance between sensor terminals No. 2 and 4, with sensor at specified temperatures. See «FUEL TANK TEMPERATURE SENSOR RESISTANCE»(ref-151807-S13910385672003010800000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor
19. Remove EVAP control system pressure sensor with harness connector connected. Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
20. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. 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-151813) 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-151813) 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 EVAPORATIVE SYSTEM»(ref-151810-S38949408772003010800000) 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 level sensor/FTT sensor assembly terminals No. 5 and 6 as shown in illustration. (Scheme 58) 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

FUEL TANK TEMPERATURE SENSOR RESISTANCE

Scheme 54

Scheme 55

Scheme 56

Scheme 57

Scheme 58

Diagnostic Procedure (DTC P0455 Or P1442)

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 retest system.
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 and retest system.
4. Check EVAP system hoses for cracks, improper connection or disconnection. See «VACUUM DIAGRAMS»(ref-151813) article. If problem is found, repair as necessary. If problem is not found, clean purge line with compressed air, and go to next step.
5. Check EVAP-CVCV, "O" ring and circuit. Perform appropriate DTC CONFIRMATION TEST under «DTC P1448: EVAP CANISTER VENT CONTROL VALVE (OPEN)»(ref-151807-S04172837442003010800000). If 1st trip DTC is detected, repair as necessary. If 1st trip DTC is not detected, go to next step.
6. Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. (Scheme 54) 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-151813) article. If a leak is found, repair as necessary. If no leak is found, go to step 9.
8. Turn ignition off. Disconnect EVAP Canister Vent Control Valve (EVAP-CVCV) and vacuum cut valve by-pass valve harness connectors. (Scheme 55) Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. 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-151813) 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 using generic scan tool, go to step 11.
10. Disconnect EVAP-CPVCV 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 13. If vacuum does not exist, go to step 12.
11. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect EVAP-CPVCV 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-CPVCV hose. If vacuum exists, go to step 13. If vacuum does not exist, go to next step.
12. Check EVAP system vacuum hoses for blockages or leaks. See «VACUUM DIAGRAMS»(ref-151813) 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, replace EVAP-CPVCV.
15. Turn ignition off. Remove EVAP-CPVCV. Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. (Scheme 57) 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-CPVCV.
16. Remove FTT sensor. Measure resistance between sensor terminals No. 2 and 4, with sensor at specified temperatures. See «FUEL TANK TEMPERATURE SENSOR RESISTANCE»(ref-151807-S13910385672003010800000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
17. Remove EVAP control system pressure sensor with harness connector connected. Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
18. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
19. Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness or improper connection. See «VACUUM DIAGRAMS»(ref-151813) article. If problem is found, repair or replace hoses or tubes as necessary. If problem is not found, go to next step.
20. 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.
21. Check refueling control valve. See «EMISSION SYSTEMS & SUB-SYSTEMS»(ref-151810-S04472114852003010800000) 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.
22. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Note. Before performing the following procedure, confirm battery voltage is more than 11 volts at idle.

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-CPVCV harness connector. (Scheme 53) Turn ignition on. Measure voltage between ground and EVAP-CPVCV harness connector terminal No. 1 (Green/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 connector F32 terminal No. 4 (Green/Yellow wire). (Scheme 27) Check for poor connection at fuse, fusible link and relay block connector E3 terminal 34R (Green/Yellow wire). (Scheme 23) Check fuse No. 58 (10-amp) located in fuse, fusible link and relay block on right side of engine compartment. Check for open or short in Green/Yellow wire between fuse and EVAP-CPVCV. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Blue/Yellow wire between EVAP-CPVCV harness connector terminal No. 2 and ECM harness connector terminal No. 54. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
4. If using CONSULT-II, go to next step. If using generic scan tool, go to step 7.
5. Reconnect all harness connectors. Start engine. Perform "PURG VOL CONT/V" in "ACTIVE TEST" mode with CONSULT-II. Check that engine speed varies according to the valve opening. If engine speed is correct, go to step 8. If engine speed is not correct, go to next step.
6. Disconnect hoses from EVAP-CPVCV. (Scheme 53) Command PURG VOL CONT/V to 100 percent with CONSULT-II. Air should flow between EVAP-CPVCV ports "A" and "B". Command PURG VOL CONT/V to zero percent. Air should not flow between EVAP-CPVCV ports "A" and "B". If operation is as specified, go to step 8. If operation is not as specified, replace EVAP-CPVCV.
7. Turn ignition off. Remove EVAP-CPVCV. (Scheme 53) Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. (Scheme 57) 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-CPVCV.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

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 using generic scan tool, go to step 3.
2. Turn ignition off then on. Select VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. Press ON/OFF on CONSULT-II screen. Listen for EVAP-CVCV operating sound. For EVAP-CVCV location (Scheme 55) If operating sound is heard, go to step 7. If operating sound is not heard, go to next step.
3. Turn ignition off. Disconnect EVAP-CVCV harness connector. (Scheme 55) Turn ignition on. Measure voltage between ground and EVAP-CVCV harness connector terminal No. 1 (Green/Orange wire). If battery voltage exists, go to step 5. If battery voltage does not exist, go to next step.
4. Check the following: Check for poor connection at Light Blue, 8-pin in-line harness connector B401 terminal No. 4 (Green/Orange wire). (Scheme 33) Connector B401 is located under rear of vehicle, near EVAP-CVCV. Check for poor connection at Brown, 4-pin in-line harness connector E224 terminal No. 2 (Green/Red wire). For location (Scheme 28) Check for poor connection at fuse, fusible link and relay block connector E3 terminal 33R (Green/Red wire). (Scheme 23) Check fuse No. 58 (10-amp) located in fuse, fusible link and relay block on right side of engine compartment. 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 Blue/Yellow wire between EVAP-CVCV harness connector terminal No. 2 and ECM harness connector terminal No. 158. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If a problem is found, go to next step. If circuit is okay, go to step 7.
6. Check the following: Check for poor connection at Light Blue, 8-pin in-line harness connector B401 terminal No. 3 (Blue/Yellow wire). (Scheme 33) Connector B401 is located under rear of vehicle, near EVAP-CVCV. Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 53V (Orange wire). (Scheme 26)and (Scheme 30). Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 15T (Blue/Yellow wire). (Scheme 25)and (Scheme 27). Check for open or short between EVAP-CVCV and ECM. Repair as necessary.
7. Disconnect hose from EVAP-CVCV. Check hose for clogging. If hose is okay, go to next step. If hose is not okay, clean with compressed air.
8. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 59) 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 59) 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 59

Note. Always perform test at a temperature of 41°F (5°C) or more.

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 that "FUEL T/TEMP SE" is more than 32°F (0°C). Start engine and wait at least 20 seconds. 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 (Using Generic Scan Tool)

Start engine and warm to normal operating temperature. Check that voltage between ECM terminal No. 92 (fuel tank temperature sensor signal) and ground is less than 4.2 volts. Turn ignition off and wait at least 10 seconds. Start engine and wait at least 20 seconds. Select "MODE 7" on 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.

Scheme 60

Scheme 61

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Go to next step.
2. Disconnect EVAP-CSPS harness connector. Inspect connector for water. If water exists, repair or replace EVAP-CSPS connector. If water does not exist, go to next step.
3. Turn ignition on. Measure voltage between ground and EVAP-CSPS harness connector terminal No. 1 (Blue wire). (Scheme 60) If voltage is about 5 volts, go to step 5. If voltage is not about 5 volts, go to next step.
4. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 23T (Blue wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 58V (Yellow wire). (Scheme 26)and (Scheme 30). Check for open or short in Blue wire or Yellow wire between EVAP-CSPS and ECM. Repair as necessary.
5. Turn ignition off. Check continuity of Red wire between ground and EVAP-CSPS harness connector terminal No. 3. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
6. Disconnect ECM harness connector. see scheme 5 Check continuity of Green wire between EVAP-CSPS harness connector terminal No. 2 and ECM harness connector terminal No. 110. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
7. Remove EVAP control system pressure sensor with harness connector connected. (Scheme 55) Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
8. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Note. Always perform test at a temperature of 41°F (5°C) or more.

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 that FUEL T/TEMP SE is more than 32°F (0°C). Start engine and wait at least 20 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

Start engine and warm to normal operating temperature. Ensure voltage between ground and Purple/White wire at ECM terminal No. 92 (fuel tank temperature sensor signal) is less than 4.2 volts. Turn ignition off and wait at least 10 seconds. Start engine and wait at least 20 seconds. Select MODE 7 on 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.

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Go to next step.
2. Disconnect EVAP-CSPS harness connector. (Scheme 55) Inspect connector for water. If water exists, repair or replace EVAP-CSPS connector. If water does not exist, go to next step.
3. Turn ignition on. Measure voltage between ground and EVAP-CSPS harness connector terminal No. 1 (Blue wire). If voltage is about 5 volts, go to step 5. If voltage is not about 5 volts, go to next step.
4. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 23T (Blue wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 58V (Yellow wire). (Scheme 26)and (Scheme 30). Check for open or short in Blue wire or Yellow wire between EVAP-CSPS and ECM. Repair as necessary.
5. Turn ignition off. Check continuity of Red wire between ground and EVAP-CSPS harness connector terminal No. 3. Continuity should exist. Also, check circuit for short to ground and short to voltage. If continuity is not as specified, go to next step. If circuit is okay, go to step 7.
6. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 10T (Black wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 56V (Red wire). (Scheme 26)and (Scheme 30). Check for open or short in Black wire or Red wire between EVAP-CSPS and ECM. Repair as necessary.
7. Disconnect ECM harness connector. see scheme 5 Check continuity of Green wire between EVAP-CSPS harness connector terminal No. 2 and ECM harness connector terminal No. 110. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If continuity is not as specified, go to next step. If circuit is okay, go to step 9.
8. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 9T (Green wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 55V (Green wire). (Scheme 26)and (Scheme 30). Check for open or short in Green wire between EVAP-CSPS and ECM. Repair as necessary.
9. Disconnect hose from EVAP-CVCV. Check hose for clogging. If hose is okay, go to next step. If hose is not okay, clean with compressed air.
10. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 59) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
11. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
12. 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 14. 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. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 59) 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.
14. Remove EVAP control system pressure sensor with harness connector connected. Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
15. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
16. Disconnect hose from EVAP-CVCV. Check hose for obstruction. If hose is okay, go to next step. If hose is not okay, clean with compressed air or replace hose.
17. Remove water separator and inspect hoses for blockage. (Scheme 55) With water separator port "A" plugged, blow air into port "B". (Scheme 56) 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 and retest system.
18. 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 20. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is less than 4.6 lbs. (2.1 kg), go to step 20. If weight is 4.6 lbs. (2.1 kg) or more, go to next step.
19. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. If problem is found, repair as necessary. If problem is not found, go to next step.
20. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Note. If DTC P0456 is displayed with P0442, or if DTC P1456 is displayed with P1442, first perform trouble diagnosis for DTC P0456 or P1456. After repair, ensure that the hoses and clips are installed properly. Before performing the following procedure, confirm that battery voltage is more than 11 volts at idle. Open hood before conducting the following procedure. If any of following conditions are met just before the DTC confirmation procedure, leave the vehicle for more than one hour: Fuel filler cap is removed. Fuel has be refilled or drained. EVAP components is/are removed.

1. Turn ignition on and select DATA MONITOR mode with CONSULT-II.
2. Ensure the following conditions are met. FUEL LEVEL SE: 0.25 - 1.4V. 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 NG is displayed, turn ignition off and leave the vehicle in a cool place (soak the vehicle) or refill/drain fuel until the output voltage condition of the FUEL LEVEL SE meets within the range above and leave the vehicle for more than one hour. Then start from 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 the instructions displayed on CONSULT-II screen.
4. Ensure that "OK" is displayed. If "NG" is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S31546943862004011600000) .

Note. Use this procedure to check the overall function of the EVAP very small leak function. During this check, a 1st trip DTC might not be confirmed.

1. Attach the EVAP service port adapter securely to the EVAP service port. (Scheme 54) Connect a pressure pump and a hose. Also connect a vacuum gauge via 3-way connector and a hose.
2. Turn ignition on. Connect scan tool and select MODE 8. Using MODE 8, control the EVAP canister vent control valve (close) and vacuum cut valve by-pass valve (open).
3. Apply pressure and ensure the following conditions are satisfied: Pressure to be applied: 0.79 in. Hg (2.7 kPa). Time to wait after the pressure drawn in to the EVAP system and the pressure to be dropped: 60 seconds and the pressure should not drop more than 0.12 in. Hg (0.4 kPa).
4. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S31546943862004011600000). If OK is displayed, go to next step.
5. Disconnect scan tool. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Restart engine and let it idle for 90 seconds. Keep engine speed at 2000 RPM for 30 seconds. Turn ignition off.

1. Turn ignition off. Check for genuine NISSAN fuel filler cap design. If okay, go to next step. If not okay, replace with genuine NISSAN fuel filler cap.
2. Check that the cap is tightened properly by rotating the cap clockwise. If okay, go to next step. If not okay, open fuel filler cap, then clean cap and fuel filler neck threads using air blower. Retighten cap until ratcheting sound is heard.
3. Check for air releasing sound while opening the fuel filler cap. If okay, go to step 5. If not okay, go to next step.
4. Check fuel tank vacuum relief valve. Relief valve is built into fuel filler cap. Wipe clean valve housing. Connect adapter to fuel filler cap. Connect in the following order: vacuum hose, vacuum/pressure gauge, one-way valve and vacuum pump in line to filler cap adapter. Check valve opening pressure and vacuum. Pressure should be 2.22-2.90 psi (15.3-20.0 kPa). Vacuum should be -0.87 to -0.48 psi (-6.0 to -3.3 kPa). If out of specification, replace fuel filler cap as an assembly. If fuel filler cap is okay, go to next step.
5. To locate the EVAP leak, install EVAP service port adapter and pressure pump to EVAP service port securely. (Scheme 54)
6. 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. Touch START and apply pressure into the EVAP line until the pressure indicator on CONSULT-II reaches the middle of the bar graph. Using EVAP leak detector, locate the EVAP leak. Repair system as necessary. If leak does not exist, go to step 10
8. Turn ignition off. Apply 12 volts to EVAP canister vent control valve 2-pin connector. The valve will close. Continue to apply 12 volts until the end of test. Apply 12 volts to vacuum cut valve by-pass valve. (Scheme 55) The valve will open. Continue to apply 12 volts until the end of test. Pressurize the EVAP line using pressure pump with 0.39 to 0.79 in. Hg (1.3 to 2.7 kPa), then remove pump and EVAP service port adapter.
9. Using EVAP leak detector, locate the EVAP leak. Repair system as necessary. If leak does not exist, go to next step.
10. Remove water separator and inspect hoses for blockage. (Scheme 55) With water separator port "A" plugged, blow air into port "B". (Scheme 56) 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 and retest system.
11. Check EVAP canister vent control valve, "O" ring or circuit. See appropriate DTC CONFIRMATION TEST under «DTC P1448: EVAP CANISTER VENT CONTROL VALVE (OPEN)»(ref-151807-S04172837442003010800000). Repair or replace components as necessary. If okay, go to next step.
12. 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 14. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is less than 4.6 lbs. (2.1 kg), go to step 14. If weight is 4.6 lbs. (2.1 kg) or more, go to next step.
13. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. If problem is found, repair as necessary. If problem is not found, go to next step.
14. If using CONSULT-II, go to next step. If using generic scan tool, go to step 16.
15. Disconnect vacuum hose connected to EVAP-CPVCV at EVAP service port. (Scheme 54) 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. While observing vacuum gauge, press "Qu" on CONSULT-II screen to adjust PURG VOL CONT/V opening. Vacuum should exist when PURG VOL CONT/V opening is 100 percent. Vacuum should not exist when PURG VOL CONT/V opening is zero percent. If operation is as specified, go to step 18. If operation is not as specified, go to step 17.
16. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose connected to EVAP-CPVCV at EVAP service port. (Scheme 54) Connect vacuum gauge to disconnected hose. Start engine and let it idle for at least 80 seconds. While observing vacuum gauge, increase engine speed to 2000 RPM. Vacuum should exist. Release throttle. Vacuum should not exist. If operation is as specified, go to step 18. If operation is not as specified, go to next step.
17. Check vacuum hose for clogging or disconnection. If hose is okay, go to next step. If hose is not okay, repair or replace hose as necessary.
18. If using CONSULT-II, go to next step. If using generic scan tool, go to step 20.
19. Disconnect hoses from EVAP-CPVCV. (Scheme 53) Command PURG VOL CONT/V to 100 percent with CONSULT-II. Air should flow between EVAP-CPVCV ports "A" and "B". Command PURG VOL CONT/V to zero percent. Air should not flow between EVAP-CPVCV ports "A" and "B". If operation is as specified, go to step 21. If operation is not as specified, replace EVAP-CPVCV.
20. Turn ignition off. Remove EVAP-CPVCV. (Scheme 53) Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. (Scheme 57) 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-CPVCV.
21. Remove Fuel Tank Temperature (FTT) sensor. Measure resistance between sensor terminals No. 2 and 4, with sensor at specified temperatures. See «FUEL TANK TEMPERATURE SENSOR RESISTANCE»(ref-151807-S13910385672003010800000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
22. Remove EVAP control system pressure sensor with harness connector connected. Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
23. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
24. Check EVAP purge line for evidence of leaks. If a leak is found, repair as necessary. If no leak is found, clean EVAP purge line with compressed air. Go to next step.
25. Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness or improper connection. See «VACUUM DIAGRAMS»(ref-151813) article. If problem is found, repair or replace hoses or tubes as necessary. If problem is not found, go to next step.
26. 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.
27. Check refueling control valve. See «EMISSION SYSTEMS & SUB-SYSTEMS»(ref-151810-S04472114852003010800000) 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.
28. Check fuel level sensor. See «DTC P0461: FUEL LEVEL SENSOR FUNCTION»(ref-151807-S30368617232003010800000). Repair or replace as necessary. If sensor is okay, go to next step.
29. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Turn ignition on. Select DATA MONITOR with scan tool. Start engine and wait a maximum of 2 consecutive 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 fuel level sensor harness connector located under trunk liner. Turn ignition on. Measure voltage between ground and fuel level sensor harness connector terminal No. 5 (Red/Blue wire). (Scheme 47) 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) harness connector M141 terminal 48V (Red/Blue wire). (Scheme 26)and (Scheme 30). Check Black, 20-pin joint connector No. 15 (connector M124). Connector M124 is taped to main harness under right instrument panel speaker. (Scheme 30)and (Scheme 31). Check for open or short in Red/Blue wire between fuel level sensor and instrument cluster harness connector terminal No. 30 (connector M42). (Scheme 62) Repair as necessary.
3. Turn ignition off. Disconnect instrument cluster harness connectors. Check continuity between fuel level sensor harness connector terminal No. 6 (Black wire) and instrument cluster harness connector terminal No. 29 (Black/Yellow wire). (Scheme 62) Continuity should exist. 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 5.
4. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 49V (Black/Yellow wire). (Scheme 26)and (Scheme 30). Check Black, 20-pin joint connector No. 15 (connector M124). Connector M124 is taped to main harness under right instrument panel speaker. (Scheme 30)and (Scheme 31). Check for open or short between fuel level sensor and instrument cluster. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of the following: Red/Blue wire between fuel level sensor harness connector terminal No. 5 and ECM harness connector terminal No. 119. Black wire between fuel level sensor harness connector terminal No. 6 and ECM harness connector terminal No. 107. (Scheme 20) Continuity should exist. Also, check circuits for short to ground and short to voltage. If problem is found, go to next step. If circuits are okay, go to step 7.
6. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 17T (Red/Blue wire) and 18T (Black wire). (Scheme 25)and (Scheme 27). Check Black, 20-pin joint connector No. 15 (connector M124). Connector M124 is taped to main harness under right instrument panel speaker. (Scheme 30)and (Scheme 31). Check for open or short between fuel level sensor and ECM. Repair as necessary.
7. Measure resistance between fuel level sensor/FTT sensor assembly terminals No. 5 and 6 as shown in illustration. (Scheme 58) 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 62

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-151802-S39076091332003010800000) in BASIC DIAGNOSTIC PROCEDURES article. Remove fuel feed hose from fuel level sensor unit located under trunk liner.
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 0.03 volt during draining and refilling. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S22693298332003010800000) . 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-151802-S39076091332003010800000) in BASIC DIAGNOSTIC PROCEDURES article. Remove fuel feed hose from fuel level sensor unit located under trunk liner.
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 at ECM terminal No. 119 (Red/Blue wire) by backprobing. see scheme 5and (Scheme 20). 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-151807-S22693298332003010800000). If voltage is as specified, system is okay at this time.

Perform step 7 in DIAGNOSTIC PROCEDURE under DTC P0460: FUEL LEVEL SENSOR FUNCTION (SLOSH).

Note. Before proceeding, ensure battery voltage is more than 11 volts with ignition on and engine off.

Turn ignition on. Select DATA MONITOR 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.

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

Note. The following test may be performed with drive wheels lifted or by road testing vehicle.

1. Start engine. Read VHCL SPEED SE in DATA MONITOR mode with CONSULT-II. If VHCL SPEED SE exceeds 6 MPH when rotating wheels at more than 6 MPH, go to next step. If VHCL SPEED SE does not exceed 6 MPH when rotating wheels at more than 6 MPH, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S03414344832003010800000) .
2. Select DATA MONITOR mode with CONSULT-II. Warm engine to normal operating temperature. Maintain the following conditions for at least 60 consecutive seconds: ENG SPEED: 1400-6000 RPM. COOLAN TEMP/S: more than 158°F (70°C). B/FUEL SCHDL: 4.5-31.9 msec. PW/ST SIGNAL: OFF. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S03414344832003010800000) . 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 and support vehicle. Start engine and select MODE 1 with scan tool. VSS reading on scan tool should be able to exceed 6 MPH. If operation is as specified, system is okay at this time. If operation is not as specified, go to DIAGNOSTIC PROCEDURE .

Check for DTCs in VDC/TCS/ABS control unit. See appropriate ANTI-LOCK/TRACTION CONTROL article in BRAKES. If DTC exists, perform appropriate diagnostic procedure. If DTC does not exist, repair combination meter. See INSTRUMENT PANELS - Q45 article in ACCESSORIES & EQUIPMENT.

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 CONSULT-II.
2. Start engine let it idle for at least one minute. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S20524888672003010800000) . If 1st trip DTC is not detected, system is okay at this time.

1. Start engine and let it idle. Check for intake air leak after mass airflow sensor. If leak is found, repair as necessary. If leak is not found, go to next step.
2. Turn engine off. Replace ECM. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000) .

Note. Before performing the following procedure, confirm that battery voltage is more than 11 volts at idle. Always perform the test at a temperature above 14°F (-10°C).

Open hood. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on again and select DATA MONITOR mode with scan tool. Start engine and run it for at least one minute at idle speed. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE . If 1st trip DTC is not detected, system is okay at this time.

1. Confirm that PCV hose is connected correctly. Repair or replace as necessary. If PCV hose is okay, go to next step.
2. Start engine and let it idle. Listen for an intake air leak after the mass airflow sensor. If air leak is found, repair as necessary. If air leak is not found, go to next step.
3. Stop engine. Replace ECM. After replacement, perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000) .

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 36) Disconnect PSP sensor harness connector. (Scheme 63) Turn ignition on. Measure voltage between ground and PSP sensor harness connector terminal No. 1 (Blue wire). 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 connector E315 terminal No. 6 (Blue wire). (Scheme 46) Connector E315 is connected to connector F5. For location (Scheme 27) Check for open or short between PSP sensor and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and PSP 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 circuit is okay, go to step 5.
4. Check the following: Check for poor connection at connector E315 terminal No. 1 (Black wire). (Scheme 46) Connector E315 is connected to connector F5. For location (Scheme 27) Joint connector No. 30 (connector F108). (Scheme 27)and (Scheme 31). Check for open or short between PSP sensor and ECM. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of Red wire between PSP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 118. (Scheme 20) Continuity should exist. 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 connector E315 terminal No. 7 (Red wire). (Scheme 46) Connector E315 is connected to connector F5. For location (Scheme 27) Check for open or short between PSP sensor and ECM. Repair as necessary.
7. Reconnect all harness connectors. Start engine and let it idle. Measure voltage between ground and ECM terminal No. 118 (Red 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.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 63

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 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" .

1. Turn ignition on and wait at least one second. Select DATA MONITOR 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-151807-S30728610202003010800000) . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to «DTC CONFIRMATION TEST "C"»(ref-151807-S10272297182003010800000) .

1. Turn ignition on and wait at least one second. Select DATA MONITOR with scan tool.
2. Turn ignition off and wait at least 10 seconds. Turn ignition on.
3. Repeat step 2 a total of 32 times.
4. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S30728610202003010800000) . 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-151807-S31012512582003010800000) again. If 1st trip DTC is detected, replace ECM. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000) . 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-151807-S31012512582003010800000) 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 harness connectors. Turn ignition on. Measure voltage between ground and instrument cluster harness connector terminal No. 59 (Green wire). (Scheme 62) If battery voltage exists, go to step 3. If battery voltage does not exist, go to next step.
2. Check the following: Check Blue, 20-pin joint connector No. 4 (connector M22). Connector M22 is taped to main harness, to left of instrument cluster. (Scheme 30)and (Scheme 31). Check for poor connection at fuse block No. 1 harness connector M1 terminal 7C (Green wire). (Scheme 21) Check fuse No. 9 (10-amp) located in fuse block No. 1. Check for open or short in Green wire between fuse block No. 1 and instrument cluster. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity between instrument cluster harness connector terminal No. 65 (Gray/Blue wire) and ECM harness connector terminal No. 35 (Yellow/Green wire). (Scheme 20) Continuity should exist. 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 5.
4. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 19T (Yellow/Green wire). (Scheme 25)and (Scheme 27). Check for open or short between instrument cluster and ECM. Repair as necessary.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

1. Turn ignition on and wait at least one second. Select DATA MONITOR mode with CONSULT-II.
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 a total of 4 times. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S12317572372003010800000) . 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 ECM harness connector terminal No. 95 (White wire). (Scheme 20) 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) harness connector F105 terminal 21T (White wire). (Scheme 25)and (Scheme 27). Check joint connector No. 16 (connector M125). (Scheme 30)and (Scheme 31). Check for poor connection at fuse block No. 2 connector M145 terminal 6N (White wire). (Scheme 22) Check fuse No. 32 (10-amp) located under right side of instrument panel in fuse block No. 2. Check for open or short between ECM and battery. Repair as necessary.
3. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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-151807-S03264364212003010800000). If 1st trip DTC P1065 is detected again, replace ECM. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000). 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-151807-S03264364212003010800000). If 1st trip DTC P1065 is detected again, replace ECM. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000). If 1st trip DTC P1065 is not detected, test is complete.

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Maintain the following conditions for at least 5 seconds: ENG SPEED: more than idle speed. Transmission selector lever: Park or Neutral.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S20567591922003010800000) . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect IVT control solenoid valve harness connector. (Scheme 32) Turn ignition on. Measure voltage between ground and appropriate IVT control solenoid valve harness connector terminal No. 2 (White/Blue 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) harness connector F105 terminal 4T (White/Blue wire). (Scheme 25)and (Scheme 27). Check for open or short between IVT control solenoid valve and connector F105. (Scheme 25)and (Scheme 27). Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Pink wire between left IVT control solenoid valve harness connector terminal No. 1 and ECM harness connector terminal No. 152, or White/Black wire between right IVT control solenoid valve harness connector terminal No. 1 and ECM harness connector terminal No. 155. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
4. 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 terminal. Continuity should not exist. Replace IVT control solenoid valve if resistance or continuity is not as specified. If IVT control solenoid valve tests okay, go to next step.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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 radiator coolant temperature sensor harness connector. (Scheme 64) Turn ignition on. Measure voltage between ground and radiator coolant temperature sensor harness connector terminal No. 1 (Green/Red wire). 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 Gray, 10-pin connector F33 terminal No. 3 (Green/Red wire). (Scheme 46) For connector location (Scheme 27) Check for open or short between radiator coolant temperature sensor and ECM. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and radiator coolant temperature 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 circuit is okay, go to step 5.
4. Check the following: Check for poor connection at connector F32 terminal No. 8 (Black wire). (Scheme 27) Joint connector No. 30 (connector F108). (Scheme 27)and (Scheme 31). Check for open or short between radiator coolant temperature sensor and ECM. Repair as necessary.
5. Remove radiator coolant temperature sensor, and place in heated water. Measure resistance between sensor terminals, with water at specified temperatures. See «RADIATOR COOLANT TEMPERATURE SENSOR SPECIFICATIONS»(ref-151807-S33538741632003010800000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace radiator coolant temperature sensor.
6. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

RADIATOR COOLANT TEMPERATURE SENSOR SPECIFICATIONS

Scheme 64

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 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-151807-S24450764232003010800000) . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to «DTC CONFIRMATION TEST "C"»(ref-151807-S01681954952003010800000) .

1. Turn ignition on and wait at least one second. Select DATA MONITOR mode with scan tool. Shift transmission into Drive and wait at least 2 seconds. Shift transmission into Park or Neutral.
2. Start engine and let it idle for 3 seconds. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S24450764232003010800000) . If 1st trip DTC is not detected, system is okay at this time.

1. Remove intake air 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 ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000) .

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 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 electric throttle control actuator harness connector. (Scheme 42) Disconnect ECM harness connector. see scheme 5 Check continuity between specified electric throttle control actuator terminals and ECM harness connector terminals. See «CHECKING ELECTRIC THROTTLE CONTROL ACTUATOR-TO-ECM CIRCUIT CONTINUITY»(ref-151807-S16755447402004011400000) table. (Scheme 20)and (Scheme 47). Also, check circuits for short to ground and short to voltage. If problem is found, repair as necessary. If circuits are okay, go to next step.
2. Remove intake air 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.
3. Measure resistance between electric throttle control actuator terminals No. 3 and 6 (component side). Resistance should be about 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 5.
4. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Replace electric throttle control actuator. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000).

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.

1. Turn ignition off. Remove throttle control motor relay. (Scheme 65) Disconnect ECM harness connector. see scheme 5 Measure voltage between ground and throttle control motor relay harness connector terminals No. 2 and 3 (White/Blue wires). (Scheme 66) 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. 74 (15-amp) located in fuse, fusible link and relay box on right side of engine compartment. Check for open or short between throttle control motor relay and battery. Repair as necessary.
3. Check continuity of Blue wire between throttle control motor relay harness connector terminal No. 5 and ECM harness connector terminal No. 157. (Scheme 20) Continuity should exist. 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 5.
4. Check the following: Check for poor connection at connector F32 terminal No. 5 (Blue wire). (Scheme 27) Check for open or short between throttle control motor relay and ECM. Repair as necessary.
5. Check continuity of Orange wire between throttle control motor relay harness connector terminal No. 1 and ECM harness connector terminal No. 26. Continuity should exist. 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 connector F32 terminal No. 1 (Orange wire). (Scheme 27) Check for open or short between throttle control motor relay and ECM. Repair as necessary.
7. Using jumper wires, apply battery voltage between throttle control motor relay terminals No. 1 and 2. (Scheme 66) Check continuity between terminals No. 3 and 5. Continuity should exist. Remove jumper wires. Continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace throttle control motor relay.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 65

Scheme 66

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 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 2 engine ground bolts. (Scheme 36) Go to next step.
2. Disconnect electric throttle control actuator harness connector. (Scheme 42) Disconnect ECM harness connector. see scheme 5 Check continuity between specified electric throttle control actuator terminals and ECM harness connector terminals. See «CHECKING ELECTRIC THROTTLE CONTROL ACTUATOR-TO-ECM CIRCUIT CONTINUITY»(ref-151807-S16755447402004011400000) table. (Scheme 20)and (Scheme 47). Also, check circuits for short to ground and short to voltage. If problem is found, repair as necessary. If circuits are okay, go to next step. CHECKING ELECTRIC THROTTLE CONTROL ACTUATOR-TO-ECM CIRCUIT CONTINUITY Actuator Terminals No. ECM Terminals No. Continuity 3 151 No 3 154 Yes 6 151 Yes 6 154 No
3. Measure resistance between electric throttle control actuator terminals No. 3 and 6 (component side). (Scheme 47) Resistance should be about 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 5.
4. Check for intermittent condition. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Replace electric throttle control actuator. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000).

Turn ignition on. Select DATA MONITOR mode with scan tool. Maintain the following conditions for at least 10 seconds

1. ENG SPEED: more than idle speed.
2. Transmission: Park or Neutral.

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 appropriate IVT control position sensor harness connector. (Scheme 32) Turn ignition on. Measure voltage between ground and appropriate IVT control position sensor harness connector terminal No. 3 (Green/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 connector F32 terminal No. 4 (Green/Yellow wire). (Scheme 27) Check fuse No. 58 (10-amp) located in fuse, fusible link and relay block on right side of engine compartment. Check for poor connection at fuse, fusible link and relay block connector E3 terminal 34R (Green/Yellow wire). (Scheme 23) Check for open or short between appropriate IVT control position sensor and fuse. Repair as necessary.
3. Turn ignition off. Check continuity between engine ground and appropriate IVT control position sensor harness connector terminal No. 1 (Black/Yellow wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 5.
4. Check the following: Check joint connector No. 29 (connector F107) located under right side of instrument panel. (Scheme 27)and (Scheme 31). Check for open or short between engine ground and IVT control position sensor. Repair as necessary.
5. Disconnect ECM harness connector. see scheme 5 Check continuity of Yellow wire between left IVT control position sensor harness connector terminal No. 2 and ECM harness connector terminal No. 73, or White wire between right IVT control position sensor harness connector terminal No. 2 and ECM harness connector terminal No. 74. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
6. Remove IVT control position sensor. Visually inspect sensor for chipping. Measure resistance of sensor as shown in illustration. (Scheme 51) If resistance is as specified and sensor is not chipped, go to next step. If resistance is not as specified or sensor is chipped, replace IVT control position sensor.
7. Check CKP sensor (POS). See step 7 under DIAGNOSTIC PROCEDURE under DTC P0335: CRANKSHAFT POSITION SENSOR (POS). If sensor is okay, go to next step. If sensor is not okay, replace CKP sensor (POS).
8. Check CMP sensor (PHASE). See step 7 under DIAGNOSTIC PROCEDURE under DTC P0340: CAMSHAFT POSITION SENSOR (PHASE). If sensor is okay, go to next step. If sensor is not okay, replace CMP sensor (PHASE).
9. Check for accumulation of debris on signal pick-up portion of camshaft. Remove debris and clean camshaft as necessary. If accumulation of debris is not present, go to next step.
10. Disconnect joint connectors No. 28 (connector F106) and No. 29 (connector F107) located under right side of instrument panel. (Scheme 27)and (Scheme 31). Check the following: Check continuity of shield circuit (Gray wire) between joint connector No. 28 terminals No. 1 and 3. Check continuity of shield circuit (Gray wire) between joint connector No. 28 terminal No. 3 and joint connector No. 29 terminal No. 3. Check continuity between ground and shield circuit (Gray wire) at joint connector No. 29 terminal No. 3. Check joint connectors No. 28 and 29. Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
11. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

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 about 40 seconds or more). ENG SPEED: 1100-2000 RPM. Vehicle speed: less than 62 MPH. B/FUEL SCHDL: 1.6-12.0 msec. If TESTING is not displayed after 5 minutes, retry from step 2 .
7. Press SELF-DIAG RESULTS. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S23847712882003010800000) . 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.

Start engine and warm to normal operating temperature. Measure voltage between ground and left front HO2S signal circuit (Red/Blue wire) at ECM terminal No. 114 (DTC P1143), or right front HO2S signal circuit (Blue/White wire) at ECM terminal No. 115 (DTC P1163) by backprobing. see scheme 5and (Scheme 20). While observing voltmeter, increase engine speed to 2000 RPM. The following conditions should exist

1. Maximum voltage should be more than .6 volt at least once.
2. Minimum voltage should be more than .1 volt at least once.

If voltage is not as specified, go to DIAGNOSTIC PROCEDURE . If voltage is as specified, system is okay at this time.

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Loosen and retighten appropriate front HO2S to 30-37 ft. lbs. (40-50 N.m). (Scheme 44) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Run engine for at least 10 minutes at idle speed. If 1st trip DTC P0171 or P0174 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or P0174. See «DTC P0171 OR P0174: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (LEAN)»(ref-151807-S14911151182003010800000). If 1st trip DTC P0171 or P0174 is not detected and engine is not difficult to start, go to step 4.
3. Turn ignition off. Disconnect MAF sensor harness connector. (Scheme 37) Start engine and let it idle for at least 5 seconds. Turn engine off. Reconnect MAF sensor harness connector. Ensure 1st trip DTC P0102, P0103 or P1102 is set. Clear 1st trip DTC from memory. Ensure DTC P0000 is displayed. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0171 or P0174 is detected and engine is difficult to start, perform diagnosis for DTC P0171 or P0174. See «DTC P0171 OR P0174: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (LEAN)»(ref-151807-S14911151182003010800000). If 1st trip DTC P0171 or P0174 is not detected and engine is not difficult to start, go to next step.
4. Turn ignition off. Disconnect appropriate front HO2S harness connector. (Scheme 44) Measure resistance between HO2S terminals No. 2 and 3. (Scheme 67) Resistance should be 2.3-4.0 ohms at 77°F (25°C). Check continuity between HO2S terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S tests as specified, go to next step. If HO2S does not test as specified, replace HO2S.
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 percent 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 0.6 volt at least once. HO2S1 (B1)/(B2) voltage goes below 0.3 volt at least once. HO2S1 (B1)/(B2) voltage never exceeds one volt. If operation is as specified, go to step 8. If operation is not as specified, replace appropriate HO2S.
7. Measure voltage between ground and ECM terminal No. 114 (left front HO2S) or No. 115 (right front HO2S) by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle between zero and.3 volt, and between.6 volt and one volt 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 HO2S.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 67

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 40 seconds or more). ENG SPEED: 1100-2000 RPM. Vehicle speed: less than 62 MPH. B/FUEL SCHDL: 1.6-12.0 msec. If TESTING is not displayed after 5 minutes, retry from step 2 .
7. Press SELF-DIAG RESULTS. If NG is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S00970706162003010800000) . 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.

Start engine and warm to normal operating temperature. Measure voltage between ground and left front HO2S signal circuit (Red/Blue wire) at ECM terminal No. 114 (DTC P1144), or right front HO2S signal circuit (Blue/White wire) at ECM terminal No. 115 (DTC P1164) by backprobing. see scheme 5and (Scheme 20). While observing voltmeter, increase engine speed to 2000 RPM. The following conditions should exist

1. Maximum voltage should be less than .8 volt at least once.
2. Minimum voltage should be less than .35 volt at least once.

If voltage is not as specified, go to DIAGNOSTIC PROCEDURE . If voltage is as specified, system is okay at this time.

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Loosen and retighten appropriate front HO2S to 30-37 ft. lbs. (40-50 N.m). (Scheme 44) Start engine and warm to normal operating temperature. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear self-learning control coefficient by pressing CLEAR. Run engine for at least 10 minutes at idle speed. If 1st trip DTC P0172 or P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0172 or P0175. See «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0172 or 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 37) Start engine and let it idle for at least 5 seconds. Turn engine off. Reconnect MAF sensor harness connector. Ensure 1st trip DTC P0102, P0103 or P1102 is set. Clear 1st trip DTC from memory. Ensure DTC P0000 is displayed. Start engine and let it idle for at least 10 minutes. If 1st trip DTC P0172 or P0175 is detected and engine is difficult to start, perform diagnosis for DTC P0172 or P0175. See «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If 1st trip DTC P0172 or P0175 is not detected and engine is not difficult to start, go to next step.
4. Turn ignition off. Disconnect appropriate front HO2S harness connector. (Scheme 44) Measure resistance between HO2S terminals No. 2 and 3. (Scheme 67) Resistance should be 2.3-4.0 ohms at 77°F (25°C). Check continuity between HO2S terminal No. 1 and terminals No. 2, 3 and 4. Continuity should not exist. Also, check continuity between HO2S terminal No. 4 and terminals No. 1, 2 and 3. Continuity should not exist. If HO2S tests as specified, go to next step. If HO2S does not test as specified, replace HO2S.
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 percent 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 0.6 volt at least once. HO2S1 (B1)/(B2) voltage goes below 0.3 volt at least once. HO2S1 (B1)/(B2) voltage never exceeds one volt. If operation is as specified, go to step 8. If operation is not as specified, replace appropriate HO2S.
7. Measure voltage between ground and ECM terminal No. 114 (left front HO2S) or No. 115 (right front HO2S) by backprobing. Increase engine speed to 2000 RPM. The following should occur: Voltage should cycle between zero and.3 volt, and between.6 volt and one volt 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 HO2S.
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Note. For better results, perform DTC WORK SUPPORT at a temperature of 32-86°F (0-30°C).

1. Turn ignition on and select DATA MONITOR mode with CONSULT-II. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute.
3. Select HO2S2 (B1) P1146 or HO2S2 (B2) P1166 of HO2S2 in DTC WORK SUPPORT mode with CONSULT-II.
4. Start engine and follow the instructions of CONSULT-II.
5. Ensure that "OK" is displayed after touching SELF-DIAG RESULTS. If "NG" is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S29539523902004011200000) . If CAN NOT BE DIAGNOSED is displayed, go to next step.
6. Turn ignition off and leave the vehicle in a cool place (soak the vehicle). Return to step 1 .

Note. Use this procedure to check the overall function of the HO2S2 circuit. During this check, a 1st trip DTC might not be confirmed.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load.
2. Let engine idle for one minute. Connect voltmeter between ground and ECM connector terminal No. 123 (Purple wire for HO2S2 (B1) signal) or terminal No. 124 (Black wire for HO2S2 (B2) signal).
3. Check the voltage when revving engine up to 4000 RPM under no load at least 10 times. Depress and release accelerator pedal as quickly as possible. The voltage should be below 0.48 volt at least once during this procedure. If voltage is not as specified, go to next step.
4. Keep vehicle idling for 10 minutes, then check the voltage. Or, check the voltage when coasting from 50 MPH in "D" position. The voltage should be below 0.48 volt at least once during this procedure. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S29539523902004011200000) .

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Go to next step.
2. If using CONSULT-II, go to next step. If using generic scan tool, go to step 4.
3. Start engine and warm to normal operating temperature. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear the self-learning control coefficient by touching CLEAR. Run engine for at least 10 minutes at idle speed. If engine is difficult to start and DTC P0172 or P0175 is detected, go to «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If engine starts and no DTCs are detected, go to next step.
4. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect mass airflow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed. (Scheme 37) Stop engine and reconnect mass airflow sensor harness connector. Ensure DTC P0102 is displayed.
5. Erase the DTC memory. Ensure DTC P0000 is displayed. Run engine for at least 10 minutes at idle speed. If engine is difficult to start and DTC P0172 or P0175 is detected, go to «DTC P0172 OR P0175: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (RICH)»(ref-151807-S05775764632003010800000). If engine starts and no DTCs are detected, go to next step.
6. Turn ignition off. Disconnect appropriate rear HO2S harness connector. (Scheme 45) Check continuity between engine ground and appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 8.
7. Check the following: On left side, check for poor connection at connector E315 terminal No. 10 (Black/Red wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 2 (White wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check for open or short to voltage between appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side) and ground. Repair as necessary.
8. Disconnect ECM harness connector. see scheme 5 Check continuity between left rear HO2S harness connector terminal No. 1 (Brown wire) and ECM harness connector terminal No. 123 (Purple wire), or check continuity of Black wire between right rear HO2S harness connector terminal No. 1 and ECM harness connector terminal No. 124. (Scheme 20) Continuity should exist. 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 10.
9. Check the following: On left side, check for poor connection at connector E315 terminal No. 4 (Brown wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 8 (Black wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check for open or short between rear HO2S and ECM. Repair as necessary.
10. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
11. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed between 3500-4000 RPM for one minute under no load. Let engine idle for one minute.
12. Select FUEL INJECTION in ACTIVE TEST mode with CONSULT-II. Select HO2S2 (B1)/(B2) as the monitor item. Observe HO2S2 (B1)/(B2) reading while adjusting FUEL INJECTION to +25 percent and -25 percent. HO2S2 (B1)/(B2) reading should be more than.58 volt when FUEL INJECTION is +25 percent. HO2S2 (B1)/(B2) reading should be less than.48 volt when FUEL INJECTION is -25 percent. If operation is as specified, go to step 16. If operation is not as specified, replace malfunctioning HO2S.
13. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed between 3500-4000 RPM for one minute under no load. Let engine idle for one minute. Connect voltmeter between ground and ECM terminal No. 123 (Purple wire for HO2S2 (B1) signal) or terminal No. 124 (Black wire for HO2S2 (B2) signal).
14. Check the voltage when revving engine up to 4000 RPM under no load at least 10 times. Depress and release accelerator pedal as quickly as possible. The voltage should be above 0.58 volt at least once during this procedure. If voltage is not as specified, go to next step.
15. Keep vehicle idling for 10 minutes, then check voltage. Or, check the voltage when coasting from 50 MPH in "D" position. Voltage should be below 0.48 volt at least once during this procedure. If voltage is not as specified, replace appropriate HO2S2. If voltage is as specified, go to next step.
16. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Note. For better results, perform DTC WORK SUPPORT at a temperature of 32-86°F (0-30°C).

1. Turn ignition on and select DATA MONITOR mode with CONSULT-II. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds.
2. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute.
3. Select HO2S2 (B1) P1147 or HO2S2 (B2) P1167 of HO2S2 in DTC WORK SUPPORT" mode with CONSULT-II.
4. Start engine and follow the instructions of CONSULT-II.
5. Ensure that "OK" is displayed after touching SELF-DIAG RESULTS. If "NG" is displayed, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S39035392352004011200000) . If CAN NOT BE DIAGNOSED is displayed, go to next step.
6. Turn ignition off and leave the vehicle in a cool place (soak the vehicle). Return to step 1 .

Note. Use this procedure to check the overall function of the HO2S2 circuit. During this check, a 1st trip DTC might not be confirmed.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep the engine speed between 3500-4000 RPM for at least one minute under no load.
2. Let engine idle for one minute. Connect voltmeter between ground and ECM connector terminal No. 123 (Purple wire for HO2S2 (B1) signal) or terminal No. 124 (Black wire for HO2S2 (B2) signal).
3. Check the voltage when revving engine up to 4000 RPM under no load at least 10 times. Depress and release accelerator pedal as quickly as possible. The voltage should be above 0.58 volt at least once during this procedure. If voltage is not as specified, go to next step.
4. Keep vehicle idling for 10 minutes, then check the voltage. Or, check the voltage when coasting from 50 MPH in "D" position. The voltage should be above 0.58 volt at least once during this procedure. If voltage is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S39035392352004011200000) .

1. Turn ignition off. Loosen and retighten 2 engine ground bolts. (Scheme 36) Go to next step.
2. If using CONSULT-II, go to next step. If using generic scan tool, go to step 4.
3. Start engine and warm to normal operating temperature. Select SELF-LEARNING CONT in WORK SUPPORT mode with CONSULT-II. Clear the self-learning control coefficient by touching CLEAR. Run engine for at least 10 minutes at idle speed. If engine is difficult to start and DTC P0171 or P0174 is detected, go to «DTC P0171 OR P0174: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (LEAN)»(ref-151807-S14911151182003010800000). If engine starts and no DTCs are detected, go to step 6.
4. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect mass airflow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed. (Scheme 37) Stop engine and reconnect mass airflow sensor harness connector. Ensure DTC P0102 is displayed.
5. Erase the DTC memory. Ensure DTC P0000 is displayed. Run engine for at least 10 minutes at idle speed. If engine is difficult to start and DTC P0171 or P0174 is detected, go to «DTC P0171 OR P0174: BANK 1 OR BANK 2 FUEL INJECTION SYSTEM FUNCTION (LEAN)»(ref-151807-S14911151182003010800000). If engine starts and no DTCs are detected, go to next step.
6. Turn ignition off. Disconnect appropriate rear HO2S harness connector. (Scheme 45) Check continuity between engine ground and appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If circuit is okay, go to step 8.
7. Check the following: On left side, check for poor connection at connector E315 terminal No. 10 (Black/Red wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 2 (White wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check for open or short to voltage between appropriate rear HO2S harness connector terminal No. 4 (Black/Red wire on left side; White wire on right side) and ground. Repair as necessary.
8. Disconnect ECM harness connector. see scheme 5 Check continuity between left rear HO2S harness connector terminal No. 1 (Brown wire) and ECM harness connector terminal No. 123 (Purple wire), or check continuity of Black wire between right rear HO2S harness connector terminal No. 1 and ECM harness connector terminal No. 124. (Scheme 20) Continuity should exist. 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 10.
9. Check the following: On left side, check for poor connection at connector E315 terminal No. 4 (Brown wire). (Scheme 46) On right side, check for poor connection at connector E315 terminal No. 8 (Black wire). Connector E315 is connected to connector F5. For location (Scheme 27) Check for open or short between rear HO2S and ECM. Repair as necessary.
10. If using CONSULT-II, go to next step. If using generic scan tool, go to step 13.
11. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed between 3500-4000 RPM for one minute under no load. Let engine idle for one minute.
12. Select FUEL INJECTION in ACTIVE TEST mode with CONSULT-II. Select HO2S2 (B1)/(B2) as the monitor item. Observe HO2S2 (B1)/(B2) reading while adjusting FUEL INJECTION to +25 percent and -25 percent. HO2S2 (B1)/(B2) reading should be more than.58 volt when FUEL INJECTION is +25 percent. HO2S2 (B1)/(B2) reading should be less than.48 volt when FUEL INJECTION is -25 percent. If operation is as specified, go to step 16. If operation is not as specified, replace malfunctioning HO2S.
13. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed between 3500-4000 RPM for one minute under no load. Let engine idle for one minute. Connect voltmeter between ground and ECM terminal No. 123 (Purple wire for HO2S2 (B1) signal) or terminal No. 124 (Black wire for HO2S2 (B2) signal).
14. Check the voltage when revving engine up to 4000 RPM under no load at least 10 times. Depress and release accelerator pedal as quickly as possible. The voltage should be above 0.58 volt at least once during this procedure. If voltage is not as specified, go to next step.
15. Keep vehicle idling for 10 minutes, then check voltage. Or, check the voltage when coasting from 50 MPH in "D" position. Voltage should be below 0.48 volt at least once during this procedure. If voltage is not as specified, replace appropriate HO2S2. If voltage is as specified, go to next step.
16. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute.
2. 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-151807-S31762200802003010800000) .
3. Let engine idle for at least 5 minutes. Maintain the following conditions for at least 50 consecutive seconds: B/FUEL SCHDL: 4 msec or more. ENG SPEED: more than 1300 RPM. VHCL SPEED SE: more than 44 MPH. NOTE: DTC P0132 and/or P0152 may be displayed on CONSULT-II during this test. If DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S31762200802003010800000) . If DTC is not detected, system is okay at this time.

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

1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and keep engine speed between 3500-4000 RPM for at least one minute under no load. Let engine idle for one minute.
2. To check closed loop operation, measure voltage between ground and left front HO2S signal circuit (Red/Blue wire) at ECM terminal No. 114 or right front HO2S signal circuit (Blue/White wire) at ECM terminal No. 115, by backprobing. see scheme 5and (Scheme 20).
3. Monitor voltmeter with engine speed 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-151807-S31762200802003010800000). If voltage is as specified, system is okay at this time.

See DTC P0133 OR P0153: BANK 1 OR BANK 2 HO2S1 (RESPONSE MONITORING) .

Note. Before performing the following procedure, confirm that 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 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 ANTI-LOCK/TRACTION CONTROL 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 ANTI-LOCK/TRACTION CONTROL 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. Check the coolant level in the reservoir tank and radiator. If coolant level is okay, go to next step. If the coolant level in the reservoir tank and/or radiator is below the proper range, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000) .
2. If customer added coolant, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000) . If customer did not add coolant, go to next step.
3. Start engine. If cooling fan operates, go to next step. If cooling fan does not operate, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000) .
4. Select TARGET FAN RPM in ACTIVE TEST mode with CONSULT-II. Change TRGT FAN RPM indication by touching UP and DOWN.
5. Cooling fan operating speed should change according to TRGT FAN RPM indication. If operation is as specified, system is okay at this time. If operation is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000) .

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

1. Check the coolant level in the reservoir tank and radiator. If coolant level is okay, go to next step. If the coolant level in the reservoir tank and/or radiator is below the proper range, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000).
2. If customer added coolant, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000). If customer did not add coolant, go to next step.
3. Start engine. If cooling fan operates, go to next step. If cooling fan does not operate, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000).
4. Turn ignition off. Disconnect radiator coolant temperature sensor harness connector. (Scheme 64) Connect a 2.2 k/ohm resistor between radiator coolant temperature sensor harness connector terminals.
5. Restart engine. Cooling fan should operate at a higher speed than in step 3. If operation is as specified, system is okay at this time. If operation is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S13774959762003010800000).

1. Start engine. If cooling fan operates, go to next step. If cooling fan does not operate, check the following: Cooling fan fluid for leak. Drive belts. Cooling fan pump. Cooling fan drive pump. Repair as necessary.
2. If using CONSULT-II, go to next step. If using generic scan tool, go to step 4.
3. Select TARGET FAN RPM in ACTIVE TEST mode with CONSULT-II. Change TRGT FAN RPM indication by touching UP and DOWN. Cooling fan operating speed should change according to TRGT FAN RPM indication. If operation is as specified, go to step 8. If operation is not as specified, go to step 5.
4. Turn ignition off. Disconnect radiator coolant temperature sensor harness connector. (Scheme 64) Connect a 2.2 k/ohm resistor between radiator coolant temperature sensor harness connector terminals. Start engine. Cooling fan should operate at a higher speed than in step 1. If operation is as specified, go to step 8. If operation is not as specified, go to next step.
5. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity between ground and ECM harness connector terminal No. 28 (Blue wire). (Scheme 20) Continuity should not exist. If continuity exists, repair short to ground. If continuity does not exist, go to next step.
6. Disconnect cooling fan speed control solenoid valve harness connector. (Scheme 52) Measure resistance between cooling fan speed control solenoid valve terminals (component side). Resistance should be about 8 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace cooling fan speed control solenoid valve.
7. Check the following: Cooling fan fluid for leak. Drive belts. Cooling fan pump. Cooling fan drive pump. Repair as necessary.
8. Remove radiator coolant temperature sensor, and place in heated water. Measure resistance between sensor terminals, with water at specified temperatures. See «RADIATOR COOLANT TEMPERATURE SENSOR SPECIFICATIONS»(ref-151807-S26163222672003010800000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace radiator coolant temperature sensor.
9. Using a cooling system pressure tester, apply 23 psi (157 kPa) to cooling system. If pressure holds, go to next step. If pressure drops, repair cooling system leak as necessary.
10. Using a radiator pressure tester, check radiator cap relief pressure. Relief pressure should be 9-14 psi (59-98 kPa). If relief pressure is as specified, go to next step. If relief pressure is not as specified, replace radiator cap.
11. Remove thermostat. Inspect thermostat valve for proper seating at normal room temperature. Place thermostat in heated water. Thermostat should begin opening at 180°F (82°C). Thermostat should open more than.394" (10.0 mm) at 203°F (95°C). Thermostat should be closed at 171°F (77°C). If operation is as specified, go to next step. If operation is not as specified, replace thermostat.
12. Remove ECT sensor. (Scheme 41) Place ECT sensor in heated water. Measure resistance between ECT sensor terminals, with water at specified temperatures. See «ENGINE COOLANT TEMPERATURE SENSOR RESISTANCE»(ref-151807-S26163222672003010800000) table. If resistance is as specified, go to next step. If resistance is not as specified, replace ECT sensor.
13. Check for other possible causes engine overheating. Repair as necessary. Test is complete.

RADIATOR COOLANT TEMPERATURE SENSOR SPECIFICATIONS

ENGINE COOLANT TEMPERATURE (ECT) SENSOR RESISTANCE

Note. Before proceeding, ensure battery voltage is more than 10 volts with ignition on.

Turn ignition on. Select DATA MONITOR with scan tool. Ensure COOLAN TEMP/S reading on scan tool is less than 158°F (70°C). Start engine. Maintain the following conditions for 12 seconds

1. ENG SPEED: 1100-2450 RPM.
2. VHCL SPEED SE: more than 43 MPH.
3. B/FUEL SCHDL: 1-10 msec.

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 FPCM harness connector. (Scheme 68) Turn ignition on. Measure voltage between ground and FPCM harness connector terminal No. 2 (Black/Yellow wire). (Scheme 69) 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) harness connector B211 terminal 69V (Black/Yellow wire). (Scheme 26) Check for open or short between connector B211 and FPCM. Repair as necessary.
3. Turn ignition off. Check continuity between body ground and FPCM 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 circuit is okay, go to next step.
4. Remove trim from trunk, and disconnect fuel pump harness connector. Disconnect dropping resistor harness connector. (Scheme 68) Check continuity of Green/Red wire between FPCM harness connector terminal No. 4, fuel pump harness connector terminal No. 1 and dropping resistor harness connector terminal No. 2. Continuity should exist. 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 6.
5. Check the following: Check for poor connection at White, 10-pin in-line connector B63 terminal No. 7 (Green/Red wire). (Scheme 70) Connector B63 is located at right rear of trunk. Check for open or short between FPCM, fuel pump and dropping resistor. Repair as necessary.
6. Disconnect ECM harness connector. see scheme 5 Check continuity of Green/Red wire between FPCM harness connector terminal No. 4 and ECM harness connector terminal No. 116. see scheme 5and (Scheme 20). Continuity should exist. 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 8.
7. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 24T (Green/Red wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 57V (Green/Red wire). (Scheme 26)and (Scheme 30). Check for open or short between FPCM and ECM. Repair as necessary.
8. Check continuity of Black/Red wire between ECM harness connector terminal No. 25 and FPCM harness connector terminal No. 1. Continuity should exist. 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 10.
9. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 8T (Black/Red wire). (Scheme 25)and (Scheme 27). Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 59V (Black/Red wire). (Scheme 26)and (Scheme 30). Check for open or short between ECM and FPCM. Repair as necessary.
10. Reconnect all harness connectors. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Measure voltage between ground and FPCM terminal No. 4 (Green/Red wire) by backprobing. (Scheme 69) Observe voltage while starting engine. While engine is cranking, voltage should be about zero volts. After engine has started, voltage should be about 5 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace FPCM.
11. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 68

Scheme 69

Scheme 70

Note. Before performing the following procedure, confirm that battery voltage is more than 10 volts at idle. Turn ignition on. Select DATA MONITOR mode with scan tool. Turn ignition off, then 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 the intake air duct. Check if foreign matter is caught between the throttle valve and the housing. Remove the foreign matter and clean the electric throttle control actuator as necessary. If intake air duct is okay, go to next step.
2. Replace electric throttle control actuator. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000) .

Note. Before performing the following procedure, confirm that battery voltage is more than 10 volts at idle. Turn ignition on. Select DATA MONITOR mode with scan tool. Turn ignition off, then wait at least 10 seconds. Turn ignition on. Repeat steps 3 and 4 a total of 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 the intake air duct. Check if foreign matter is caught between the throttle valve and the housing. Remove the foreign matter and clean the electric throttle control actuator as necessary. If intake air duct is okay, go to next step.
2. Replace electric throttle control actuator. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000) .

Note. Before performing the following procedure, confirm that 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 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 2 engine ground bolts. (Scheme 36) Go to next step.
2. Disconnect electric throttle control actuator harness connector. (Scheme 42) Turn ignition on. Check voltage between electric throttle control actuator terminal No. 1 (Blue/White wire) and ground. (Scheme 47) Voltage should be about 5 volts. If voltage is as specified, go to step 5. If voltage is not as specified, go to next step.
3. Check circuits for short to ground and short to voltage between ECM harness connector terminal No. 103 (Blue wire) and specified terminal at each component/sensor. See «COMPONENT/SENSOR TERMINAL IDENTIFICATION»(ref-151807-S37987036712004011400000) table. If problem is found, repair as necessary. If circuits are okay, go to next step. COMPONENT/SENSOR TERMINAL IDENTIFICATION Application Terminal No. APP Sensor 7 Electric Throttle Control Actuator 1 EVAP Control System Pressure Sensor 1 MAF Sensor 2 Power Steering Pressure Sensor 1 Refrigerant Pressure Sensor 1
4. Check the following components for malfunction: accelerator pedal position sensor, mass airflow sensor, EVAP control system pressure sensor and power steering pressure sensor. See appropriate DTC in «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-151807-S04918008042003010800000). Replace malfunctioning component as necessary. If components are okay, go to step 7.
5. Reconnect all harness connectors. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000). Turn ignition on. Shift transmission into Drive. Measure voltage between ground and ECM terminals No. 98 (White wire) and No. 108 (Black/White wire) by backprobing, with accelerator pedal in specified positions. See «TP SENSOR VOLTAGE»(ref-151807-S37608975972003010800000) table. If voltage is not as specified, go to next step. If voltage is as specified, go to step 7.
6. Replace electric throttle control actuator. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000).
7. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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. 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 «DIAGNOSTIC PROCEDURE»(ref-151807-S06509413672003010800000) .
7. If OK is displayed, 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 at least 20 seconds.
2. Select MODE 7 with scan tool. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S06509413672003010800000) . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect EVAP-CPVCV harness connector. (Scheme 53) Turn ignition on. Measure voltage between ground and EVAP-CPVCV harness connector terminal No. 1 (Green/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 connector F32 terminal No. 4 (Green/Yellow wire). (Scheme 27) Check for poor connection at fuse, fusible link and relay block connector E3 terminal 34R (Green/Yellow wire). (Scheme 23) Check fuse No. 58 (10-amp) located in fuse, fusible link and relay block on right side of engine compartment. Check for open or short in Green/Yellow wire between fuse and EVAP-CPVCV. Repair as necessary.
3. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of Blue/Yellow wire between EVAP-CPVCV harness connector terminal No. 2 and ECM harness connector terminal No. 54. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
4. Check for disconnection or improper connection of hose connected to EVAP-CSPS. (Scheme 55) See «VACUUM DIAGRAMS»(ref-151813) article. If problem is found, repair as necessary. If problem is not found, go to next step.
5. Disconnect EVAP-CSPS harness connector. Inspect connector for water. If water exists, repair or replace EVAP-CSPS connector. If water does not exist, go to next step.
6. Remove EVAP control system pressure sensor with harness connector connected. (Scheme 55) Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
7. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. 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 using generic scan tool, go to step 10.
9. Turn ignition off. Reconnect all disconnected 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. Turn ignition off. Remove EVAP-CPVCV. Using jumper wires, apply battery voltage to EVAP-CPVCV terminals. (Scheme 57) 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-CPVCV.
11. Remove EVAP-CVCV. Check for rust in port "B". (Scheme 59) 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 59) 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 less than 4.6 lbs. (2.1 kg), go to step 17. If weight is 4.6 lbs. (2.1 kg) or more, go to next step.
16. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. If problem is found, repair as necessary. If problem is not found, go to next step.
17. Remove water separator and inspect hoses for blockage. (Scheme 55) With water separator port "A" plugged, blow air into port "B". (Scheme 56) 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 and retest system.
18. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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 55) 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 56) 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 59) 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 59) 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 4.6 lbs. (2.1 kg), go to next step. If weight is less than 4.6 lbs. (2.1 kg), go to step 9.
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 control system pressure sensor with harness connector connected. (Scheme 55) Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
11. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
12. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) 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. 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-151800) 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 55) 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 not flow between ports "A" and "B". (Scheme 59) When VENT CONTROL/V is OFF, air should flow between ports "A" and "B".
8. If operation is not as specified, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S33064950252003010800000). If operation is as specified, go to «DIAGNOSTIC PROCEDURE (DTC P0442)»(ref-151807-S41666432992003010800000) under DTC P0442, P0455 OR P1442: 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 55) Disconnect EVAP-CVCV harness connector. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 59) 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-151807-S33064950252003010800000). If operation is as specified, go to «DIAGNOSTIC PROCEDURE (DTC P0442)»(ref-151807-S41666432992003010800000) under DTC P0442, P0455 OR P1442: EVAP CONTROL SYSTEM.

1. Disconnect hose connected to EVAP-CVCV. (Scheme 55) 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 59) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
2. If using CONSULT-II, go to next step. If using generic scan tool, go to step 4.
3. 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 5. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
4. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 59) 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.
5. Remove vacuum cut valve. (Scheme 55) Plug ports "C" and "D" with fingers. (Scheme 71) 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.
6. 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 8. If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is 4.6 lbs. (2.1 kg) or more, go to next step. If weight is less than 4.6 lbs. (2.1 kg), go to step 8.
7. Inspect EVAP canister for damage. Also, check hose between water separator and EVAP canister for blockage or poor connection. Repair hose or replace EVAP canister as necessary. If EVAP canister and hose are okay, go to next step.
8. Check for disconnection or improper connection of hose connected to EVAP-CSPS. (Scheme 55) 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.
9. Remove EVAP control system pressure sensor with harness connector connected. (Scheme 55) Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
10. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 71

Turn ignition on. Select DATA MONITOR 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 Disconnect instrument cluster harness connectors. Check continuity between ECM harness connector terminal No. 107 (Black wire) and instrument cluster harness connector terminal No. 29 (Black/Yellow wire). see scheme 5and (Scheme 62). Continuity should exist. 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 3.
2. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 18T (Black wire). (Scheme 25)and (Scheme 27). Check Black, 20-pin joint connector No. 15 (connector M124). Connector M124 is taped to main harness under right instrument panel speaker. (Scheme 30)and (Scheme 31). Check for open or short between ECM and instrument cluster. Repair as necessary.
3. Check instrument cluster and ground circuit. See «INSTRUMENT PANELS - Q45»(ref-154091) article in ACCESSORIES & EQUIPMENT. If problem is found, repair as necessary. If problem is not found, go to next step.
4. Measure resistance between fuel level sensor/FTT sensor assembly terminals No. 5 and 6 as shown in illustration. (Scheme 58) If resistance is as specified, go to next step. If resistance is not as specified, replace fuel level sensor.
5. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

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

1. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Ensure RADIATOR TEMP indicates less than 176°F (80°C). Allow engine to cool, if necessary. Start engine and let it idle for at least 5 seconds.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S18829984932003010800000) . If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to «DTC CONFIRMATION TEST "B"»(ref-151807-S21802971162003010800000) .

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

1. Turn ignition on. Measure voltage between engine ground and radiator coolant temperature sensor signal circuit at ECM terminal No. 122 (Green/Red wire) by backprobing. see scheme 5and (Scheme 20).
2. Ensure voltage is more than 1.23 volts. Allow engine to cool, if necessary. Start engine and let it idle for at least 5 seconds. If 1st trip DTC is not detected, turn ignition off, wait at least 10 seconds and go to «DTC CONFIRMATION TEST "B"»(ref-151807-S21802971162003010800000).

1. Turn ignition off. Disconnect radiator coolant temperature sensor harness connector. (Scheme 64) Connect a 2200-ohm resistor between radiator coolant temperature sensor harness connector terminals.
2. Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine and let it idle for at least 5 seconds. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S18829984932003010800000). If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Disconnect cooling fan speed control solenoid valve harness connector. (Scheme 52) Disconnect ECM harness connector. see scheme 5 Check continuity of Red wire between cooling fan speed control solenoid valve harness connector terminal No. 1 and ECM harness connector terminal No. 47. (Scheme 20) Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
2. Check continuity of Blue wire between cooling fan speed control solenoid valve harness connector terminal No. 2 and ECM harness connector terminal No. 28. Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
3. Measure resistance between cooling fan speed control solenoid valve terminals. Resistance should be about 8 ohms at 68°F (20°C). If resistance is as specified, go to next step. If resistance is not as specified, replace radiator cooling fan speed control solenoid valve.
4. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Note. Before performing the following procedure, confirm that battery voltage is more than 11 volts at idle.

Turn ignition on. Select DATA MONITOR 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. 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. (Scheme 55) Turn ignition on. Measure voltage between ground and vacuum cut valve by-pass valve harness connector terminal No. 1 (Green/Orange 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. 58 (10-amp) located in fuse, fusible link and relay block on right side of engine compartment. Check for poor connection at Light Blue, 8-pin in-line harness connector B401 terminal No. 2 (Green/Orange wire). (Scheme 33) Connector B401 is located under rear of vehicle, near EVAP canister vent control valve. Check for poor connection at Brown, 4-pin in-line harness connector E224 terminal No. 1 (Green/Red wire). For location (Scheme 28) Check for poor connection at fuse, fusible link and relay block connector E3 terminal No. 33R (Green/Red wire). (Scheme 23) 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 Green/Yellow wire between vacuum cut valve by-pass valve harness connector terminal No. 2 and ECM harness connector terminal No. 43. (Scheme 20) Continuity should exist. 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 Light Blue, 8-pin in-line harness connector B401 terminal No. 1 (Green/Yellow wire). (Scheme 33) Connector B401 is located under rear of vehicle, near EVAP canister vent control valve. Check for poor connection at Super Multiple Junction (SMJ) harness connector M141 terminal 52V (Green/Yellow wire). (Scheme 26)and (Scheme 30). Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 16T (Green/Yellow wire). (Scheme 25)and (Scheme 27). 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 72) 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 72

Note. Always perform test when ambient temperature is 41-86°F (5-30°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. 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-151807-S41590896692003010800000) . 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 55) Apply vacuum to port "A". (Scheme 71) 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 55) Apply vacuum to port "A". (Scheme 71) 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 73) 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 72) 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 71) 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 55) 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 control system pressure sensor with harness connector connected. (Scheme 55) Remove hose from EVAP control system pressure sensor. Install a vacuum pump to EVAP control system pressure sensor. Turn ignition on. Use pump to apply vacuum and pressure to EVAP control system pressure sensor.
13. Measure voltage between engine ground and ECM terminal No. 110 (Green wire) by backprobing. see scheme 5and (Scheme 20). Voltage should be 1.8-4.8 volts. Using a hand vacuum pump, apply 7.87 in. Hg (26.65 kPa) of vacuum to pressure sensor. Voltage should be 2.1-2.5 volts less than voltage measured with no vacuum applied. Voltage should decrease as vacuum is applied. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
14. Disconnect hose connected to EVAP-CVCV. (Scheme 55) 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 59) If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
15. If using CONSULT-II, go to next step. If using generic scan tool, go to step 17.
16. 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 18. 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. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. (Scheme 59) 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 18. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
18. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 73

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-151807-S16979861432003010800000) .
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: ENG SPEED: more than 1200 RPM. COOLAN TEMP/S: more than 158°F (70°C). B/FUEL SCHDL: 2-31 msec. VHCL SPEED SE: more than 40 MPH. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S16979861432003010800000) . 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, 1st trip DTC may not be confirmed.

To check overall function of PNP switch circuit, turn ignition on. Measure voltage between body ground and PNP switch signal circuit at ECM terminal No. 80 (Gray/Red wire) by backprobing. see scheme 5and (Scheme 20). With transmission in Park or Neutral, voltage should be about zero volts. With transmission in any other position, battery voltage should exist. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE.

1. If using CONSULT-II, go to next step. If using generic scan tool, go to step 3.
2. Turn ignition on. Select A/T, then DATA MONITOR mode with CONSULT-II. Select P/N POSI SW signal. With transmission in Park or Neutral, P/N POSI SW should indicate ON. With transmission in any other position, P/N POSI SW should indicate OFF. If operation is as specified, go to step 5. If operation is not as specified, go to step 4.
3. Ensure PNP switch signal is sent to Transmission Control Module (TCM) correctly. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If signal is sent to TCM correctly, go to step 5. If signal is not sent to TCM correctly, go to next step.
4. Repair PNP switch circuit. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. Test is complete.
5. Turn ignition off. Disconnect TCM harness connector. see scheme 5 Disconnect fuse block No. 1 harness connector M1. (Scheme 21) Check continuity between fuse block No. 1 harness connector M1 terminal 17D (Black/Yellow wire) and TCM harness connector terminal No. 48 (Black/White wire). (Scheme 74) Continuity should exist. 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 Super Multiple Junction (SMJ) harness connector F105 terminal 30T (Black/Red wire). (Scheme 25)and (Scheme 27). Check for open or short between TCM and fuse block No. 1. Repair as necessary.
7. Check continuity between ground and fuse block No. 1 harness connector E201 terminal 1E (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
8. Disconnect ECM harness connector. see scheme 5 Check continuity of Gray/Red wire between ECM harness connector terminal No. 80 and fuse block No. 1 harness connector M1 terminal 19D. (Scheme 20)and (Scheme 21). Continuity should exist. 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 10.
9. Check the following: Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 13T (Gray/Red wire). (Scheme 25)and (Scheme 27). Check Black, 20-pin joint connector No. 17 (connector M126) located above glove box. (Scheme 30)and (Scheme 31). Check for open or short between ECM and fuse block No. 1. Repair as necessary.
10. Check fuse block No. 1. (Scheme 21) If problem is found, replace fuse block No. 1. If fuse block No. 1 is okay, go to next step.
11. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 74

1. Turn ignition on. Select DATA MONITOR mode with scan tool. Start engine. Drive vehicle at 12 MPH or more for at least 5 seconds without depressing brake pedal.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S29629293562003010800000) . If 1st trip DTC is not detected, system is okay at this time.

1. Check TCM for DTCs. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If DTC is set, repair transmission control system as necessary. If DTC is not set, go to next step.
2. Check VDC/TCS/ABS control unit for DTCs. See appropriate ANTI-LOCK/TRACTION CONTROL article in BRAKES. If DTC is set, repair VDC/TCS/ABS system as necessary. If DTC is not set, go to next step.
3. Check instrument cluster function. Repair as necessary. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Test is complete.

Perform DTC confirmation test for DTC P1754. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. 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 TCM for DTCs. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If DTC is not set, go to next step. If DTC is set, diagnose as necessary.
2. Check TCM function. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If TCM is okay, go to next step. If TCM is not okay, replace TCM.
3. Replace ECM. After replacement, perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000) . Test is complete.

1. Turn ignition on. Fully depress brake pedal for at least 5 seconds. Clear DTC with scan tool. Select DATA MONITOR mode with scan tool.
2. If 1st trip DTC is detected, go to «DIAGNOSTIC PROCEDURE»(ref-151807-S00883611282003010800000) . If 1st trip DTC is not detected, system is okay at this time.

1. Turn ignition off. Check stop lamp operation. If stop lamps operate properly, go to step 4. If stop lamps do not operate properly, go to next step.
2. Disconnect stop lamp switch harness connector. (Scheme 75) 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 for poor connection at White, 4-pin in-line harness connector M401 terminal No. 1 (Red/Yellow wire). Connector M401 is located near stop lamp switch. (Scheme 30) Check Red, 20-pin joint connector No. 12 (connector M80) located behind center of instrument panel. (Scheme 30)and (Scheme 31). Check for poor connection at fuse block No. 1 connector M1 terminal 3B (Red/Yellow wire). (Scheme 21) Check fuse No. 17 (15-amp) located in fuse block No. 1. Check for open or short between stop lamp switch and battery. Repair as necessary.
4. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Disconnect stop lamp switch harness connector. (Scheme 75) Check continuity of Red/White wire between stop lamp switch harness connector terminal No. 2 and ECM harness connector terminal No. 106. (Scheme 20) Continuity should exist. 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 6.
5. Check the following: Check for poor connection at White, 4-pin in-line harness connector M401 terminal No. 2 (Red/White wire). Connector M401 is located near stop lamp switch. (Scheme 30) Check for poor connection at Super Multiple Junction (SMJ) harness connector F105 terminal 22T (Red/White wire). (Scheme 25)and (Scheme 27). Check Black, 20-pin joint connector No. 7 (connector M46) located above stop lamp switch. (Scheme 30)and (Scheme 31). Check for open or short between stop lamp switch and ECM. Repair as necessary.
6. Check continuity between stop lamp switch terminals. With brake pedal depressed, continuity should exist. With brake pedal fully released, continuity should not 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-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

Scheme 75

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

Turn ignition on. Select DATA MONITOR 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. Loosen and retighten 2 engine ground bolts. (Scheme 36) Disconnect electronic throttle control actuator harness connector. (Scheme 42)
2. Turn ignition on. Measure voltage between ground and electronic throttle control actuator harness connector terminals No. 7 (Blue wire) and No. 10 (Green wire). (Scheme 76) About 5 volts should exist at terminal No. 7 and about 2.5 volts should exist at terminal No. 10. If voltage is as specified, go to next step. If voltage is not as specified, repair open or short between electronic throttle control actuator and ECM.
3. Turn ignition off. Check continuity between engine ground and electronic throttle control actuator harness connector terminals No. 9 (Red wire) and No. 12 (Brown 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: Joint connector No. 30 (connector F108). (Scheme 27)and (Scheme 31). Check for open or short in Brown wire between electronic throttle control actuator harness connector terminal No. 12 and ECM harness connector terminal No. 100. see scheme 5and (Scheme 20). Check for open or short between electronic throttle control actuator harness connector terminal No. 9 (Red wire) and ECM harness connector terminal No. 89 (Black wire). Repair as necessary.
5. Turn ignition off. Disconnect ECM harness connector. see scheme 5 Check continuity of the following: Blue/White wire between electronic throttle control actuator harness connector terminal No. 8 and ECM harness connector terminal No. 87. Black/Red wire between electronic throttle control actuator harness connector terminal No. 11 and ECM harness connector terminal No. 117. (Scheme 20) Also, check circuits for short to ground and short to voltage. If problem is found, repair as necessary. If circuits are okay, go to next step.
6. Turn ignition off. Disconnect joint connector No. 28 (connector F106) and joint connector No. 29 (connector F107). (Scheme 27)and (Scheme 31). Check the following shield circuits: Check continuity of Gray wire between joint connector No. 28 terminal No. 3 and joint connector No. 29 terminal No. 3. Check continuity of Gray wire between joint connector No. 28 terminals No. 1 and 3. Check continuity of Gray wire between joint connector No. 28 terminals No. 1 and 2. Check continuity between engine ground and joint connector No. 29 terminal No. 3 (Gray wire). Check joint connectors No. 28 and 29. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Continuity should exist. Also, check circuits for short to voltage. If problem is found, repair as necessary. If circuits are okay, go to next step.
7. Reconnect all harness connectors. Perform throttle valve closed position learning procedure. See «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-151807-S22752529262003010800000) procedure under PROGRAMMING. Turn ignition on. Shift transmission into Drive. Measure voltage between ground and ECM terminals No. 87 (Blue/White wire) and No. 117 (Black/Red wire) by backprobing, with accelerator pedal in specified positions. See «APP SENSOR VOLTAGE»(ref-151807-S12759951802003010800000) table. If voltage is as specified, go to next step. If voltage is not as specified, replace accelerator pedal position sensor. Perform ACCELERATOR PEDAL RELEASED POSITION LEARNING procedure, THROTTLE VALVE CLOSED POSITION LEARNING procedure and IDLE AIR VOLUME LEARNING procedure. See «PROGRAMMING»(ref-151807-S07832407652003010800000).
8. No problem is indicated at this time. Problem may be intermittent. See «INTERMITTENTS»(ref-151809-S41696183142003010800000) in TROUBLE SHOOTING - NO CODES article.

APP SENSOR VOLTAGE

Scheme 76

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 DIAG SUPPORT MNTR in DATA MONITOR mode with scan tool. If OK is displayed for all circuits, system is okay. If OK is not displayed for all circuits, repair communication problem. See appropriate MULTIPLEX CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT.