Engine Controls - Self-Diagnostics: Diagnosis Suzuki Vitara I

SELF-DIAGNOSTIC SYSTEM

Note. Diagnostic information stored in Engine Control Module (ECM) memory can be retrieved and cleared using SUZUKI scan tool or On-Board Diagnostic-II (OBD-II) generic scan tool. Before using scan tool, read instruction manual carefully.

Note. Ensure to retrieve and record information stored in ECM memory as Diagnostic Trouble Codes (DTC), freeze frame data, etc. before disconnect battery cable, ECM harness connectors, ECM ground wire or main fuse. Such disconnection will erase and loose ECM memory data.

RETRIEVING DIAGNOSTIC TROUBLE CODES

DTCs are retrieved using a SUZUKI or other OBD-II compatible scan tool connected to a 16-pin Data Link Connector (DLC), located below left side of instrument panel. see scheme 3 Follow scan tool manufacturer's instructions when retrieving DTCs.

Pending DTC

Pending codes appear when a problem is detected in a monitored system. The Malfunction Indicator Light (MIL) is illuminated when a problem is detected during 2 consecutive drive cycles. A drive cycle is when the engine is started and turning off. A pending code is stored in Power Control Module (PCM) during the first drive cycle when a failed system is detected. If the system does not fail during the second drive cycle, PCM concludes that the system has returned to normal or problem was mistakenly detected, and deletes pending code. If system failure is detected during a second drive cycle, PCM concludes that suspect system has failed, deletes pending code, illuminates MIL and stores Diagnostic Trouble Codes (DTC). If during 3 drive cycles after MIL was illuminated, system failure is not detected, PCM will turn off MIL but DTC will be stored in memory.

MULTIPLE DTC PRIORITY

If two or more DTCs are stored, proceed to diagnosis of DTC which was detected earliest. If no instructions are given, troubleshoot DTCs according to following priorities

1. DTCs other than DTC P0171 and P0172 (Fuel system too lean/too rich). DTCs P0300, P0301, P0302, P0303 and P0304 (Misfire detected) and DTCs P0401 and P0402 (EGR flow malfunction).
2. DTCs P0171 and P0172 (Fuel system too lean/too rich) and DTCs P0401 and P0402 (EGR flow malfunction).
3. DTCs P0300, P0301, P0302, P0303 and P0304 (Misfire detected).

CLEARING DIAGNOSTIC TROUBLE CODES

Note. Ensure to retrieve and record information stored in ECM memory (DTC, freeze frame data, etc.) before disconnect ECM harness connectors, battery cable, ECM ground wire harness from engine or main fuse. Such disconnection will erase and loose ECM memory data.

DTCs can be cleared using a SUZUKI or other OBD-II compatible scan tool connected to Data Link Connector (DLC), located below left side of instrument panel. see scheme 3 DTCs will also clear when fault that originally set that DTC is not detected during 40 engine warm-up cycles. A warm-up cycle is when vehicle coolant temperature rises by 72°F (22°C) or reaches 158°F (70°C) after engine has first started.

SCAN TOOL USAGE

Note. Before connecting scan tool, follow steps in MALFUNCTION INDICATOR LIGHT CHECK .

Scan tool is a specialized tester which can diagnose on-board computer control systems by providing almost instant access to circuit data without crawling under instrument panel or engine hood to backprobe sensors and connectors. Scan tools reduce diagnostic time by furnishing input data (sensor values) which can be compared to specification parameters.

Scan tools also furnish status data of output devices (solenoids and motors). However, status parameters are only an indication that output signals have been sent to devices by Power Control Module (PCM). They do not indicate if devices respond properly to that signal. This must be verified at output device using a DVOM or test light.

If DTCs are not present, a problem may still exist. Driveability-related problems with DTCs displayed occur about 20 percent of the time, while driveability problems without DTCs occur about 80 percent of the time. Out-of-calibration sensors may NOT set a DTC, but WILL cause driveability problems. A scan tool is the easiest method of checking sensor specifications and other data parameters. A scan tool is also useful in finding intermittent wiring problems by wiggling wiring harnesses and connections (key on, engine off) while observing data parameters.

Note. Information obtained by a scan tool is only as accurate as the scan tool itself. A scan tool that displays faulty data should not be used. If faulty data readings are suspected, verify scan tool information using a DVOM and wiring schematic.

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTC IDENTIFICATION

Diagnosis & Repair Procedure

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. Turn ignition switch to ON position. If other instrument cluster indicators and warning lights illuminate, go to next step. If other instrument cluster indicators and warning lights do not illuminate, check following: Check IG METER fuse (20-amp). Check Main fuse (80-amp). Check for open or short in Black/White wire between IG METER fuse and instrument cluster. Check for poor, loose, corroded or damaged terminal connections in fuse box, junction block and instrument cluster harness connectors. If problem is found repair as necessary and retest system for normal operation.
2. Start engine. If engine starts, go to next step. If engine does not start, go to «A-3: MALFUNCTION INDICATOR LIGHT INOPERATIVE & ENGINE DOES NOT START (ECM POWER & GROUND CIRCUIT CHECK)»(ref-158406-S37315934032003112600000). If engine still unable to start, check starting system. See STARTERS article in ENGINE. After repair, retest system for normal operation.
3. Turn ignition switch to LOCK position. Disconnect ECM harness connectors, located under instrument panel, behind glove box. see scheme 4 Check for poor, loose, corroded or damaged ECM harness connector terminals. If connector terminals are okay, leave harness connectors disconnected and go to next step. If connector terminals are faulty, repair as necessary and retest system for normal operation.
4. Using a fuse jumper wires, ground ECM harness 35-pin connector E61 terminal No. 34 (Violet/Yellow wire). (Scheme 28) Turn ignition switch to ON position. If MIL illuminates, substitute ECM with a known good unit and retest system for normal operation. If MIL does not illuminate, check for faulty MIL bulb. If MIL bulb is faulty, replace as necessary. If MIL bulb is okay, repair open or short circuit in Violet/Yellow wire between instrument cluster and ECM. After repair, retest system for normal operation.

Scheme 28

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to a 16-pin Data Link Connector (DLC), located below left side of instrument panel. see scheme 3 Start engine. Using scan tool, retrieve DTCs. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If no DTCs are retrieved, go to next step. If any DTC is retrieved, perform engine system check. See «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000). After repair, retest system for normal operation.
2. Turn ignition switch to LOCK position. Disconnect ECM 35-pin harness connector E61, located under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. If MIL turns OFF, substitute ECM with a known good unit and retest system for normal operation. If MIL remains ON, repair short to ground in Violet/Yellow wire between ECM and instrument cluster. After repair, retest system for normal operation.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. Locate main relay under left side of dash panel see scheme 4and (Scheme 29). Check main relay operating sound while ignition switch is cycled from LOCK to ON position, then to LOCK position. If operation sound is not heard, go to next step. If operation sound is heard, go to step 6.
2. Turn ignition switch to LOCK position. Remove and inspect condition of main fuse "FI", fuse is located in main fuse box at right side of engine compartment. see scheme 4 If main fuse "FI" is okay, go to next step. If main fuse "FI" is faulty, check for short in circuits connected to this fuse. If short is found, repair as necessary and retest system for normal operation. If no short is found, replace main fuse "FI" and retest system for normal operation.
3. Remove main relay, ensure relay connector terminals are okay. Perform main relay component test. See «RELAYS»(ref-158706-S18366789222003101500000) under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING article. If relay is okay, go to next step. If relay is faulty, replace relay and retest system for normal operation.
4. Ensure ignition switch is in LOCK position. Install main relay. Disconnect ECM harness connectors, located under instrument panel, behind glove box. see scheme 4 Check ECM harness connector for poor, loose, corroded or damaged terminal connections. If connections are okay, go to next step. If connectors are faulty, repair as necessary and retest system for normal operation.
5. Turn ignition switch to ON position. Measure voltage between ground and ECM 26-pin harness connectors C51-3 terminals No. 20 (Black/White wire) and ECM 35-pin harness connector E61 terminal No. 9 (Blue wire). (Scheme 28) If voltage is 10-14 volts, go to next step. If voltage is less than 10 volts, repair open circuit in Black/White wire between fuse box and ECM, or in Blue wire between main relay and ECM, or Black/Red wire between main relay and main fuse box. After repair, retest system for normal operation.
6. Turn ignition switch to LOCK position. Using a fused jumper wire, ground ECM harness connector E61 terminal No. 9 (Blue wire). Turn ignition switch to ON position. Measure voltage between ground and ECM harness connector C51-3 terminal No. 15 (Blue/Black wire). (Scheme 28) If voltage is less than 10 volts, go to next step. If voltage is 10-14 volts, check ECM grounds for open circuit between ECM and ground points No. 4 (Black/Blue wire) and No. 5 (Black/Green wire). If open circuit is found, repair as necessary and retest system for normal operation. If ground circuits are okay, substitute ECM with a known good unit and retest system for normal operation.
7. If operation sound of main relay was heard on step 1, go to next step. If operation sound of main relay was not heard, repair open circuit in Black/Red wire between main relay and main fuse box, or in Blue/Black wire between main relay and ECM. After repair, retest system for normal operation.
8. Remove main relay, ensure relay connector terminals are okay. Perform main relay component test. See «RELAYS»(ref-158706-S18366789222003101500000) under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING article. If relay is faulty, replace relay and retest system for normal operation. If relay is okay, repair open circuit in Black/Red wire between main relay and main fuse box, or in Blue/Black wire between main relay and ECM. After repair, retest system for normal operation.

Scheme 29

1. Perform customer complain analysis as follow: Record details of problem (failure, complain) and how it occurred as described by customer. For this purpose, use of an inspection form will facilitate collecting information to the point required for proper analysis and diagnose. (Scheme 30) After performing customer complain analysis, go to next step.
2. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Retrieve DTC(s) including pending DTC(s) and freeze frame data, see «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If no DTC is retrieved, go to step 4. If any DTC is retrieved, print or record all DTC(s) and freeze frame data, then Clear DTCs, see «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. DTC indicates malfunction that occurred in system but does not indicate whether it exists now or if it occurred in the past and the normal condition has been restored now. To check which case applies, check symptom in question referring to step 4, and recheck DTC referring to Step 6 and 7. An attempt to diagnose a problem based on DTC in this step only, or failure to clear the DTC in this step, will lead to incorrect diagnosis, lead to improper diagnosis of a normal circuit or difficulty in troubleshooting. After Recording DTC(s) and freeze frame data, go to next step.
3. Perform a visual inspection. See «VISUAL INSPECTION»(ref-157312-S05956516382003080800000) under PRELIMINARY INSPECTION in BASIC DIAGNOSTIC PROCEDURES article. If no malfunction is found, go to step 5. If malfunction is found, repair or replace a necessary and go to step 11.
4. Perform a visual inspection. See «VISUAL INSPECTION»(ref-157312-S05956516382003080800000) under PRELIMINARY INSPECTION in BASIC DIAGNOSTIC PROCEDURES article. If no malfunction is found, go to step 8. If malfunction is found, repair or replace a necessary and go to step 11.
5. Perform trouble symptom confirmation as follow: Based on information recorded in step 1 and 2, confirm trouble symptoms. Also, reconfirm DTC described in each DTC diagnosis. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158406-S13049562702003112600000). If trouble symptom is identified, go to next step. If trouble symptom is not identified, go to step 7.
6. Recheck for DTCs and freeze frame data. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000). If no DTC is retrieved, go to step 8. If any DTC is retrieved, go to step 9.
7. Recheck for DTCs and freeze frame data. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000). If any DTC is retrieved, go to step 9. If no DTC is retrieved, go to step 10.
8. Check and repair complain described by customerreferring to «TROUBLE SHOOTING - NO CODES»(ref-158314) article. After malfunction was repaired, go to step 11.
9. Check and repair malfunction referring to appropriate DTC test. See «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(ref-158406-S13049562702003112600000). After malfunction is found and repair is performed, go to step 11.
10. Check for intermittent problem. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If malfunction is found, repair as necessary and go to next step.
11. Perform final confirmation test as follow: Clear DTCs, see «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Confirm that problem is not present and engine is free from any abnormal conditions. If what has been repaired is related to DTC(s), ensure same DTC(s) is not present. If DTC(s) is preset again, repeat test from step 6.

Scheme 30

DIAGNOSTIC TESTS

Note. Before replacing any component that scan tool suggests are faulty. Ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. To identify PCM terminals referenced in testing, see PIN VOLTAGE CHARTS article. To identify circuits and wire colors referenced in testing, see ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

DTC Confirmation Test

Ensure intake air temperature is 18°F (8°C) or more, and engine coolant temperature is 18-230°F (-8-110°C). Vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 5 minutes. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTCs P0031 or P0032 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Disconnect HO2S-1 4-pin harness connector C13, located before warm-up three way catalytic converter. see scheme 4 Measure resistance between HO2S-1 harness connector terminals No. 3 and 4 (component side). (Scheme 31) If resistance is 4.5-5.7 ohms, go to next step. If resistance is not 4.5-5.7 ohms, replace HO2S-1. See «HEATED OXYGEN SENSORS No. 1 & 2»(ref-157824-S30075854052003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37866579452003120200000).
3. Locate ECM 30-pin harness connector C51-2 under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. Backprobe and measure voltage between ground and ECM harness connector C51-2 terminal No. 4 (Gray wire). (Scheme 28) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, check Black/White wire and Gray wire for open circuit or short to ground between ECM and HO2S-1. If open circuit or short to ground is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37866579452003120200000). If open circuit or short to ground is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S37866579452003120200000).
4. Start engine. Allow engine to reach normal operating temperature and let it idle. Backprobe and measure voltage between ground and ECM harness connector C51-2 terminal No. 4 (Gray wire). (Scheme 28) If voltage is 0-1 volt, problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37866579452003120200000).If voltage is not 0-1 volt, check HO2S-1 connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37866579452003120200000). If connector terminals are okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S37866579452003120200000).

Scheme 31

Ensure intake air temperature is 18°F (8°C) or more, and engine coolant temperature is 18-230°F (-8-110°C). Vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and drive car at 30-40 mph (50-60 km/h) for 5 minutes. Stop vehicle and let it idle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0037 or P0038 resets, see DIAGNOSIS & REPAIR PROCEDURE. If no current or pending DTC is retrieved, check completion status of HO2S-2 monitoring test in READINESS TESTS mode. If HO2S-2 monitoring test is not completed, check vehicle condition (environmental) and repeat DTC CONFIRMATION TEST.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Disconnect HO2S-2 4-pim harness connector C62, located after warm-up three way catalytic converter. see scheme 4 Measure resistance between HO2S-2 harness connector terminals No. 3 and 4 (component side). (Scheme 31) If resistance is 11.7-14.3 ohms, go to next step. If resistance is not 11.7-14.3 ohms, replace HO2S-2. See «HEATED OXYGEN SENSORS NO. 1 & 2»(ref-157824-S30075854052003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S15971078312003120200000).
3. Locate ECM 35-pin harness connector C61 under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. Backprobe and measure voltage between ground and ECM harness connector C61 terminal No. 3 (Pink/Green wire). (Scheme 28) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, check Black/White wire and Pink/Green wire for open circuit or short to ground between ECM and HO2S-2. If open circuit or short to ground is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S15971078312003120200000). If open circuit or short to ground is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S15971078312003120200000).
4. Drive vehicle at 30-40 MPH for 2 minutes or more. Stop vehicle and let it idle. Backprobe and measure voltage between ground and ECM harness connector C61 terminal No. 3 (Pink/Green wire). (Scheme 28) If voltage is 0-1 volt, problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S15971078312003120200000).If voltage is not 0-1 volt, check HO2S-2 connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S15971078312003120200000). If connector terminals are okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S15971078312003120200000).

Ensure intake air temperature is 8°F (18°C) or more, and engine coolant temperature is 18-230°F (-8-110°C). Vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and drive vehicle at 35 MPH for 5 minutes. Stop vehicle and let it idle for one minute. Drive vehicle with engine speed at 2500 RPM for 30 seconds or more. Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0101 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Check MAF sensor and air intake system for blockage. Also check intake air system for leaks. If blockage or air leak is not found, go to next step. If blockage or leak is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S40491020932003120200000) .
3. Start engine and allow it to reach normal operating temperature. Using scan tool, read MAF sensor values at idle speed and at 2500 RPM. MAF sensor value should be 1.5-4.0 grams/second at idle speed, and 5-10 grams/second at 2500 RPM. If MAF sensor values are not as specified, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S40491020932003120200000) . If MAF sensor values are as specified, problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S40491020932003120200000) .

Ensure intake air temperature is 8°F (18°C) or more, and engine coolant temperature is 18-230°F (-8-110°C). Vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 20 seconds or more. Using scan tool, check for DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0102 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Start engine and allow it to reach normal operating temperature. Using scan tool, read MAF sensor values at idle speed and at 2500 RPM. MAF sensor value should be 1.5-4.0 grams/second at idle speed, and 5-10 grams/second at 2500 RPM. If MAF sensor values are not as specified, go to next step. If MAF sensor values are as specified, problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S25867645242003120200000).
3. Turn ignition switch to LOCK position. Disconnect MAF sensor 3-pin harness connector C32, located between air cleaner box and intake hose. see scheme 4 Turn ignition switch to ON position. Measure voltage between ground and MAF sensor harness connector C32 terminal No. 3 (Blue/Black wire). (Scheme 32) If voltage is 10-14 volts, go to next step. If voltage is less than 10 volts, repair open circuit in Blue/Black wire between ECM and MAF sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S25867645242003120200000).
4. Turn ignition switch to LOCK position. Remove ECM, see «ENGINE CONTROL MODULE»(ref-157824-S39119365112003082700000) under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. Check ECM and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S25867645242003120200000). If connector terminals are okay, reconnect ECM harness connectors. Turn ignition to ON position. Backprobe and measure voltage between ECM harness connector C51-3 terminals No. 5 (Purple/Green wire) and No. 10 (Purple/White wire). (Scheme 28) If voltage is 1.0-1.6 volts, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S25867645242003120200000). If voltage is not 1.0-1.6 volts, check MAP sensor and harness connector for proper connection. Also check Purple/White wire for open circuit between ECM and MAP sensor. If MAP sensor connection and circuit are faulty, repairs necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S25867645242003120200000). If MAP sensor connection and circuit are okay, replace MAF sensor. See «MASS AIR FLOW SENSOR»(ref-157824-S07991173072003091100000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S25867645242003120200000).

Scheme 32

Ensure intake air temperature is 6.8°F (-14°C) or more, vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position, Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow idle for 20 seconds. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0103 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Start engine and allow it to reach normal operating temperature. Using scan tool, read MAF sensor values at idle speed and at 2500 RPM. MAF sensor value should be 1.5-4.0 grams/second at idle speed, and 5-10 grams/second at 2500 RPM. If MAF sensor values are not as specified, go to next step. If MAF sensor values are as specified, problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41947501602003092400000).
3. Turn ignition switch to LOCK position. Remove ECM, see «ENGINE CONTROL MODULE»(ref-157824-S39119365112003082700000) under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. Check ECM and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S41947501602003092400000). If connector terminals are okay, reconnect ECM harness connectors and turn ignition switch to ON position. Backprobe and measure voltage between ECM harness connector C51-3 terminals No. 5 (Purple/Green wire) and No. 10 (Purple/White wire). (Scheme 28) If voltage is 1.0-1.6 volts, go to next step. If voltage is not 1.0-1.6 volts, check Purple/White wire for short to power between ECM and MAP sensor, or open circuit in Purple/Green wire between ECM and MAP sensor. If short to power or open circuit is found, repairs necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S41947501602003092400000). If shot to power or open circuit is not found, replace MAF sensor. See «MASS AIR FLOW SENSOR»(ref-157824-S07991173072003091100000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41947501602003092400000).
4. Start engine. Backprobe and measure voltage between ECM harness connector C51-3 terminals No. 5 (Purple/Green wire) and No. 10 (Purple/White wire). (Scheme 28) Voltage should rise within 5 volts when engine speed is increased. If voltage is as specified, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S41947501602003092400000). If voltage is not as specified, replace MAF sensor. See «MASS AIR FLOW SENSOR»(ref-157824-S07991173072003091100000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41947501602003092400000).

Ensure intake air temperature is 141°F (5°C) or more, and engine coolant temperature is 18-230°F (-8-110°C). Vehicle is at an altitude of 8000 feet or below, and barometric pressure is 72 kPa or more. Turn ignition switch to LOCK position, Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at 50 MPH or more for 1 minute. Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0107 or P0108 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Locate ECM 26-pin harness connector C51-3 under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. Backprobe and measure voltage between ECM harness connector C51-3 terminals No. 8 (Red/White wire) and No. 14 (White/Red wire). (Scheme 28) Voltage should be 0.2 volt or more with ignition in ON position, and 4.6 volts or less with engine running at idle speed. If voltage readings are not as specified, go to next step. If voltage readings are as specified, problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S23904447782003120200000).
3. Turn ignition switch to LOCK position. Disconnect MAP sensor 3-pin harness connector C58, located on air intake plenum. see scheme 4 Check MAP sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S23904447782003120200000). If connector terminals are okay, perform MAP sensor component test. See «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-158706-S42930731892003101500000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If MAP sensor is faulty, replace MAP sensor. See MANIFOLD ABSOLUTE PRESSURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S23904447782003120200000). If MAP sensor is okay, check Red/White wire, Blue/White wire and White/Red wire for open or short circuit between ECM and MAP sensor. If short or open circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S23904447782003120200000). If short or open circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S23904447782003120200000).

Ensure engine coolant temperature is at engine start, between 86°F (30°C). Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at more than 35 MPH for 3 minutes or more. Stop vehicle and let engine idle for 3 minutes or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0111 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Disconnect IAT sensor 2-pin harness connector C31, located on air cleaner box. see scheme 4 Check IAT sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S02051190142003092400000). If connector terminals are okay, perform IAT sensor component test. See «INTAKE AIR TEMPERATURE SENSOR»(ref-158706-S25776417722003101500000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If IAT sensor is okay, go to next step. If IAT sensor is faulty, replace IAT sensor. See «INTAKE AIR TEMPERATURE SENSOR»(ref-157824-S05795657652003090800000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S02051190142003092400000).
3. Disconnect ECM 26-pin harness connector C51-3, located under instrument panel, behind glove box. see scheme 4 Check ECM sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S02051190142003092400000). If connector terminals are okay, check for excessive resistance in Light Blue wire and Blue/White wire between ECM and IAT sensor. If excessive resistance is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S02051190142003092400000). If excessive resistance is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S02051190142003092400000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle until reaches normal operating temperature. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0112 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, observe IAT sensor values. If IAT sensor value is 302°F (150°C), go to next step. If IAT sensor value is not 302°F (150°C), problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S17429859322003092400000).
3. Turn ignition switch to LOCK position. Disconnect IAT sensor 2-pin harness connector C31, located on air cleaner box. see scheme 4 Turn ignition switch to ON position. Using scan tool, observe IAT sensor temperature values. If scan tool display is -40°F (-40°C), replace IAT sensor. See INTAKE AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. If scan tool display is not -40°F (-40°C), check for short to ground in Light Blue wire between ECM and IAT sensor. If short to ground is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S17429859322003092400000). If short to ground is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S17429859322003092400000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle until reaches normal operating temperature. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0113 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, observe IAT sensor values. If IAT sensor value is -40°F (-40°C), go to next step. If IAT sensor value is not -40°F (-40°C), problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S27410657952003092400000).
3. Turn ignition switch to LOCK position. Disconnect IAT sensor 2-pin harness connector C31, located on air cleaner box. see scheme 4 Check IAT sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S27410657952003092400000). If connector terminals are okay, turn ignition switch to ON position and measure volage between ground and IAT sensor harness connector C31 terminal No. 2 (Light Blue wire). (Scheme 33) If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, check for open circuit or short to power in Light Blue wire between ECM and IAT sensor. Turn ignition switch to LOCK position and check for ECM 26-pin harness connector C51-3 terminals for corrosion or poor connection. ECM is located under instrument panel, behind glove box. see scheme 4 If Light Blue wire circuit and ECM connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S27410657952003092400000). If Light Blue wire circuit and ECM connector terminals are okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S27410657952003092400000).
4. Connect fused jumper wire between IAT sensor harness connector C31 terminals No. 1 and 2. (Scheme 33) Turn ignition switch to ON position. Using scan tool, observe IAT sensor values. If IAT sensor value is 302°F (150°C), replace IAT sensor. See «INTAKE AIR TEMPERATURE (IAT) SENSOR»(ref-157824-S05795657652003090800000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. If IAT sensor value is not 302°F (150°C), check for open circuit in Blue/White wire between ECM and IAT sensor. Turn ignition switch to LOCK position and check for ECM 26-pin harness connector C51-3 terminals for corrosion or poor connection. ECM is located under instrument panel, behind glove box. see scheme 4 If Blue/White wire circuit and ECM connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S27410657952003092400000). If Blue/White wire circuit and ECM connector terminals are okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S27410657952003092400000).

Scheme 33

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Ensure temperature is 77-160°F (25-71°C). Start engine and allow it to reach normal operating temperature and keep engine at idle speed for 5 minutes or more. Drive vehicle at 35 MPH for 3 minutes. Stop vehicle and let engine idle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0116 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, observe and record ECT sensor value (ECT sensor 1 - engine cold). Start engine and allow it to reach normal operating temperature, observe and record ECT sensor value (ECT sensor 2 - engine warm). If difference value between ECT sensors is more than 2°F (1°C), go to next step. If difference value between ECT sensors is less than 2°F (1°C), go to step 4.
3. Check thermostat operation, by observing if heater takes a long time to become effective, or coolant flows into radiator on cold start. Thermostat should begin to open at 175.4-182.6°F (79.7-83.7°C). Thermostat should be completely open at 212°F (100°C). Thermostat valve should lift to more than 51/64" (8 mm) at 203°F (95°C). If thermostat is operating okay, go to next step. If thermostat is faulty, replace thermostat. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S35902651892003092400000).
4. Turn ignition switch to LOCK position. Disconnect ECT sensor 3-pin harness connector C10, located on water outlet cap, at rear of engine. see scheme 4 Turn ignition switch to ON position. Using scan tool, observe ECT sensor values while connecting fused jumper wire between ECT sensor harness connector C10 terminals No. 1 (Orange/Black wire) and No. 3 (Blue/White wire). (Scheme 34) Temperature displayed on scan tool should be 327°F (164°C). Also check ECT sensor values with fused jumper wire disconnected. Temperature displayed on scan tool should be now 40°F (-40°C). If temperature values are as specified, go to next step. If temperature values are not as specified, check for open or short circuit in Orange/Black wire between ECM and ECT sensor. If open or short circuit is found, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S35902651892003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S35902651892003092400000).
5. Turn ignition switch to LOCK position. Perform ECT sensor component test. See «ENGINE COOLANT TEMPERATURE SENSOR»(ref-158706-S25393550972003101500000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If ECT sensor is okay, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S35902651892003092400000). If ECT sensor is faulty, replace ECT sensor. See «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157824-S02694705802003090900000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S35902651892003092400000).

Scheme 34

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 10 seconds or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0117 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, observe and record ECT sensor value. If ECT sensor value is 327°F (164°C), go to next step. If ECT sensor value is not 401°F (205°C), problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S40276277392003092400000).
3. Turn ignition switch to LOCK position. Disconnect ECT sensor 3-pin harness connector C10, located on water outlet cap, at rear of engine. see scheme 4 Turn ignition switch to ON position. Using scan tool, observe ECT sensor values. If ECT sensor values displayed on scanner is -40°F (-40°C), replace ECT sensor. See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR»(ref-157824-S02694705802003090900000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S40276277392003092400000). If ECT sensor values displayed on scanner is not -40°F (-40°C), check for open or short circuit in Orange/Black wire between ECM and ECT sensor. If open or short circuit is found, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S40276277392003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S40276277392003092400000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 10 seconds or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0118 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, observe and record ECT sensor value. If ECT sensor value is -40°F (-40°C), go to next step. If ECT sensor value is not -40°F (-40°C), problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41062795852003092400000).
3. Turn ignition switch to LOCK position. Disconnect ECT sensor 3-pin harness connector C10, located on water outlet cap, at rear of engine. see scheme 4 Check ECT sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S41062795852003092400000). If connector terminals are okay, turn ignition switch to ON position and measure voltage between ground and ECT sensor harness connector C10 terminal No. 1 (Orange/Black wire). (Scheme 34) If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, check for open or short circuit in Orange/Black wire between ECM and ECT sensor. If open or short circuit is found, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S41062795852003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S41062795852003092400000).
4. Ensure ignition switch is in ON position. Using scan tool, observe ECT sensor values. If ECT sensor values display on scanner is 327°F (164°C), replace ECT sensor. See «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157824-S02694705802003090900000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41062795852003092400000). If ECT sensor values display on scanner is not 327°F (164°C), check for open or short circuit in Orange/Black wire between ECM and ECT sensor. If open or short circuit is found, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S41062795852003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S41062795852003092400000).

1. Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more.
2. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM.
3. Start engine and allow it to reach normal operating temperature. Drive vehicle at more than 40 MPH for 5 minutes. Stop vehicle and let engine idle for 1 minute. Drive vehicle again until engine speed reaches 2000-3000 RPM, keep this engine speed for 30 seconds or more (engine speed should be kept constant). Stop vehicle.
4. Repeat step 3 and stop vehicle. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0121 resets, see «DIAGNOSIS & REPAIR PROCEDURE»(ref-158406-S27002773062003092400000).

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition on. Using scan tool, check for other DTC related TP sensor. If no other DTC related to TP sensor are set, go to next step. If DTC P0122 or P0123 is set, diagnose these DTCs first. See «DTC P0122: THROTTLE POSITION SENSOR CIRCUIT - LOW INPUT»(ref-158406-S09531104862003092400000) or «DTC P0123: THROTTLE POSITION SENSOR CIRCUIT - HIGH INPUT»(ref-158406-S05884193762003092400000). After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000).
3. Turn ignition switch to LOCK position. If using scan tool, go to next step. If not using scan tool, locate ECM 26-pin harness connector C51-3 under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. Backprobe and measure voltage between ECM harness connector C51-3 terminals No. 9 (Red/Green wire) (Scheme 28) With throttle closed, voltage should be.5-1.2 volts. With throttle fully opened, voltage should be 3.4-4.7 volts. If voltage is not as specified, go to step 5. If voltage is as specified, check ECM and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000). If connector terminals are okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000).
4. Turn ignition switch to ON position. Check TP sensor output voltage by selecting TP sensor parameter on scan tool. Readings on scan tool with throttle closed should be.5-1.2 volts. Readings on scan tool with throttle fully opened, should be 3.4-4.7 volts. If voltages are not as specified, go to next step. If voltages are as specified, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000).
5. Turn ignition switch to LOCK position. Disconnect TP sensor 3-pin harness connector C30, located on throttle body see scheme 4 Check TP sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000). If connector terminals are okay, measure resistance between TP sensor connector terminals No. 1 and 2 (component test). (Scheme 35) Resistance should vary linearly according to throttle valve opening between 0.02-6.0 k/ohms. Also measure resistance between TP sensor connector terminals No. 1 and 3, resistance should be 4-6 k/ohms. If any resistance is not as specified, replace TP sensor. See «THROTTLE POSITION SENSOR»(ref-157824-S11938132652003090200000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000). If all resistances are as specified, check for open or short circuit in Gray/Yellow wire, Red/Green wire or Gray/Red wire between ECM and TP sensor. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000).

Scheme 35

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 10 seconds or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0122 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, check throttle valve opening percentage while depressing accelerator pedal to full throttle position. If scan tool display is zero percent, go to next step. If scan tool display is not zero percent, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S09243937472003092400000).
3. Turn ignition switch to LOCK position. Disconnect TP sensor 3-pin harness connector C30, located on throttle body see scheme 4 Check TP sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S03601898412003092400000). If connector terminals are okay, turn ignition switch to ON position and measure voltage between TP sensor harness connector C30 terminals No. 2 (Red/Green wire) and No. 3 (Gray/Red wire). (Scheme 36) If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, disconnect ECM 26-pin harness connector C51-3, located under instrument panel, behind glove box. see scheme 4 Check ECM sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S09243937472003092400000). If connector terminals are okay, check Gray/Red wire for open or short circuit between ECM and TP sensor. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S09243937472003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S09243937472003092400000).
4. Turn ignition switch to LOCK position. Measure resistance between TP sensor connector terminals No. 1 and 2 (component test). (Scheme 35) Resistance should vary linearly according to throttle valve opening between 0.02-6.0 k/ohms. Also measure resistance between TP sensor connector terminals No. 1 and 3, resistance should be 4-6 k/ohms. If any resistance is not as specified, replace TP sensor. See «THROTTLE POSITION SENSOR»(ref-157824-S11938132652003090200000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S09243937472003092400000). If all resistances are as specified, check for open or short circuit in Gray/Yellow wire, Red/Green wire or Gray/Red wire between ECM and TP sensor. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S09243937472003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S09243937472003092400000).

Scheme 36

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 10 seconds or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0123 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, check throttle valve opening percentage while depressing accelerator pedal to full throttle position. If scan tool display is zero percent, go to next step. If scan tool display is not zero percent, problem is intermittent. See «INTERMITTENTS»(ref-135851-S07515617322002022500000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000).
3. Turn ignition switch to LOCK position. Disconnect TP sensor 3-pin harness connector C30, located on throttle body see scheme 4 Check TP sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000). If connector terminals are okay, turn ignition switch to ON position and measure voltage between TP sensor harness connector C30 terminals No. 1 (Gray/Yellow wire) and No. 3 (Gray/Red wire). (Scheme 36) If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, turn ignition switch to LOCK position and disconnect ECM 26-pin harness connector C51-3, located under instrument panel, behind glove box. see scheme 4 Check ECM sensor and harness connector terminals for corrosion or poor connection. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000). If connector terminals are okay, check Gray/Red wire for open or short circuit between ECM and TP sensor. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000).
4. Measure resistance between TP sensor connector terminals No. 1 and 2 (component test). (Scheme 35) Resistance should vary linearly according to throttle valve opening between 0.02-6.0 k/ohms. Also measure resistance between TP sensor connector terminals No. 1 and 3, resistance should be 4-6 k/ohms. If any resistance is not as specified, replace TP sensor. See «THROTTLE POSITION SENSOR»(ref-157824-S11938132652003090200000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000). If all resistances are as specified, check for open or short circuit in Red/Green wire between ECM and TP sensor. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S36689664442003092400000).

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at more than 35 MPH for 5 minutes. Stop vehicle and let engine idle for 5 minutes. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0125 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Start engine and allow it to reach normal operating temperature. Let engine idle. Using scan tool, observe engine coolant temperature. If engine coolant temperature is less than 88°F (31°C), go to next step. If engine coolant temperature is more than 88°F (31°C), go to step 5.
3. Turn ignition switch to LOCK position. Disconnect ECT sensor 3-pin harness connector C10, located on water outlet cap, at rear of engine. see scheme 4 Turn ignition switch to ON position. Using scan tool, observe ECT sensor values while connecting fused jumper wire between ECT sensor harness connector C10 terminals No. 1 (Orange/Black wire) and No. 3 (Blue/White wire). (Scheme 34) Temperature displayed on scan tool should be 327°F (164°C). If temperature value is as specified, go to next step. If temperature value is not as specified, check for open or short circuit in Orange/Black wire or Blue/White wire between ECM and ECT sensor. If open or short circuit is found, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S16473847372003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S16473847372003092400000).
4. Turn ignition switch to LOCK position. Perform ECT sensor component test. See «ENGINE COOLANT TEMPERATURE SENSOR»(ref-158706-S25393550972003101500000) ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If ECT sensor is okay, go to next step. If ECT sensor is faulty, replace ECT sensor. See «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157824-S02694705802003090900000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S16473847372003092400000).
5. Check thermostat operation by observing if heater takes a long time to become effective, or coolant flows into radiator on cold start. Thermostat should begin to open at 175.4-182.6°F (79.7-83.7°C). Thermostat should be completely open at 212°F (100°C). Thermostat valve should lift to more than 51/64" (8 mm) at 203°F (95°C).If thermostat is faulty, replace thermostat. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S35902651892003092400000). If thermostat is operating okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S16473847372003092400000).

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at 50-60 MPH for 10 minutes. Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0128 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Start engine and check thermostat operation, by observing if heater takes a long time to become effective, or coolant flows into radiator on cold start. Thermostat should begin to open at 175.4-182.6°F (79.7-83.7°C). Thermostat should be completely open at 212°F (100°C). Thermostat valve should lift to more than 51/64" (8 mm) at 203°F (95°C). If thermostat is operating okay, go to next step.If thermostat is faulty, replace thermostat. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S03350075552003120500000).
3. Turn ignition switch to LOCK position. Disconnect ECT sensor 3-pin harness connector C10, located on water outlet cap, at rear of engine. see scheme 4 Turn ignition switch to ON position. Using scan tool, observe ECT sensor values while connecting fused jumper wire between ECT sensor harness connector C10 terminals No. 1 (Orange/Black wire) and No. 3 (Blue/White wire). (Scheme 34) Temperature displayed on scan tool should be 327°F (164°C). If temperature value is as specified, go to next step. If temperature value is not as specified, check for open or short circuit in Orange/Black wire or Blue/White wire between ECM and ECT sensor. If open or short circuit is found, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S03350075552003120500000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S03350075552003120500000).
4. Turn ignition switch to LOCK position. Perform ECT sensor component test. See «ENGINE COOLANT TEMPERATURE SENSOR»(ref-158706-S25393550972003101500000) ENGINE COOLANT TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If ECT sensor is okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S03350075552003120500000). If ECT sensor is faulty, replace ECT sensor. See «ENGINE COOLANT TEMPERATURE SENSOR»(ref-157824-S02694705802003090900000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S03350075552003120500000).

1. Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is at least 1/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at speeds of 35 MPH or more for 2 minutes or more. Stop vehicle and allow it to idle for one minute.
2. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0131 or P0132 resets, see «DIAGNOSIS & REPAIR PROCEDURE»(ref-158406-S18297096992003092400000).
3. If DTCs are not set, check completion status of HO2S monitoring test in READINESS TESTS mode. If testing has not been completed, check vehicle condition (environmental) and repeat «DTC CONFIRMATION TEST»(ref-158406-S37122544212003092400000).

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Start engine and allow it to reach normal operating temperature. Race engine speed up to 2000 RPM for 60 seconds. While revving engine 5 or 6 times, observe on scan tool HO2S-1 values. If HO2S-1 voltage does not deflect from below 0.3 volt to over 0.6 volt, go to next step. If HO2S-1 voltage deflect from below 0.3 volt to over 0.6 volt, go to step 4.
3. Turn ignition switch to LOCK position. Disconnect HO2S-1 4-pin harness connector C13, located between exhaust manifold and front catalytic converter. see scheme 4 Start engine and allow it to reach normal operating temperature. Race engine speed up to 2000 RPM for 60 seconds. While revving engine 5 or 6 times, measure voltage between HO2S-1 pigtail connector terminals No. 1 and 2 (component side). (Scheme 37) If HO2S-1 voltage does not deflect from below 0.3 volt to over 0.6 volt, replace HO2S-1. See «HEATED OXYGEN SENSORS NO. 1 & 2»(ref-157824-S30075854052003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. If HO2S-1 voltage does deflect from below 0.3 volt to over 0.6 volt, check for open or short circuit in Red wire and Gray/Yellow wire between ECM and HO2S-1. If open or short circuit is found, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37122544212003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S37122544212003092400000).
4. Race engine speed up to 2000 RPM for 60 seconds. Allow engine to idle. Using scan tool, check short term fuel trim value. If value is between -20 and +20 percent, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If value is not between -20 and +20 percent, perform diagnose and repair procedure for «DTC P0171 OR DTC P0172»(ref-158406-S10593180092003092400000). After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37122544212003092400000).

Scheme 37

1. Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is at least 1/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at speeds of 35 MPH or more for 2 minutes or more. Stop vehicle and allow it to idle for one minute.
2. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0133 resets, see «DIAGNOSIS & REPAIR PROCEDURE»(ref-158406-S17881721902003092400000).
3. If DTCs are not set, check completion status of HO2S monitoring test in READINESS TESTS mode. If testing has not been completed, check vehicle condition (environmental) and repeat «DTC CONFIRMATION TEST»(ref-158406-S03083416032003092400000).

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Replace HO2S-1. See «HEATED OXYGEN SENSORS NO. 1 & 2»(ref-157824-S30075854052003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0133 does not reset, problem is fixed, no further diagnose is necessary. If DTC P0133 resets, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S03083416032003092400000) .

1. Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is at least 1/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at speeds of 35 MPH or more for 2 minutes or more. Stop vehicle and allow it to idle for one minute.
2. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0134 resets, see «DIAGNOSIS & REPAIR PROCEDURE»(ref-158406-S21707726622003092400000).
3. If DTCs are not set, check completion status of HO2S monitoring test in READINESS TESTS mode. If testing has not been completed, check vehicle condition (environmental) and repeat «DTC CONFIRMATION TEST»(ref-158406-S41067606202003092400000).

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Start engine and allow it to reach normal operating temperature. Race engine speed up to 2000 RPM for 60 seconds. While revving engine 5 or 6 times, observe on scan tool HO2S-1 values. If HO2S-1 voltage does not deflect from below 0.3 volt to over 0.6 volt, go to next step. If HO2S-1 voltage deflect from below 0.3 volt to over 0.6 volt, go to step 4.
3. Turn ignition switch to LOCK position. Disconnect HO2S-1 4-pin harness connector C13, located between exhaust manifold and front catalytic converter. see scheme 4 Start engine and allow it to reach normal operating temperature. Race engine speed up to 2000 RPM for 60 seconds. While revving engine 5 or 6 times, measure voltage between HO2S-1 pigtail connector terminals No. 1 and 2 (component side). (Scheme 37) If HO2S-1 voltage does not deflect from below 0.3 volt to over 0.6 volt, replace HO2S-1. See «HEATED OXYGEN SENSORS NO. 1 & 2»(ref-157824-S30075854052003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. If HO2S-1 voltage does deflect from below 0.3 volt to over 0.6 volt, check for open or short circuit in Red wire and Gray/Yellow wire between ECM and HO2S-1. If open or short circuit is found, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41067606202003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S41067606202003092400000).
4. Race engine speed up to 2000 RPM for 60 seconds. Reduce engine speed. With engine idling, using scan tool, check short term fuel trim value. If value is between -20 and +20 percent, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If value is not between -20 and +20 percent, perform diagnose and repair procedure for «DTC P0171 OR DTC P0172»(ref-158406-S10593180092003092400000). After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41067606202003092400000).

1. Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is at least 1/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at speeds of 35 MPH or more for 2 minutes or more. Stop vehicle and allow it to idle for one minute.
2. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0137 resets, see «DIAGNOSIS & REPAIR PROCEDURE»(ref-158406-S22698172432003092400000).
3. If DTCs are not set, check completion status of HO2S monitoring test in READINESS TESTS mode. If testing has not been completed, check vehicle condition (environmental) and repeat «DTC CONFIRMATION TEST»(ref-158406-S00987469012003092400000).

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Drive vehicle at speeds of 35 MPH or more for 2 minutes or more. Stop vehicle. While revving engine 5 or 6 times, observe on scan tool HO2S-2 values. If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, go to next step. If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S00987469012003092400000).
3. Turn ignition switch to LOCK position. Disconnect HO2S-2 4-pin harness connector C54, located after front catalytic converter. see scheme 4 Start engine and allow it to reach normal operating temperature. Race engine speed up to 2000 RPM for 60 seconds. While revving engine 5 or 6 times, measure voltage between HO2S-2 pigtail connector terminals No. 1 and 2 (component side). (Scheme 37) If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, replace HO2S-1. See «HEATED OXYGEN SENSORS NO. 1 & 2»(ref-157824-S30075854052003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, check for open or short circuit in Red wire and Gray/Yellow wire between ECM and HO2S-2. If open or short circuit is found, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S00987469012003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S00987469012003092400000).

1. Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is at least 1/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at 35 MPH or more for 2 minutes or more. Stop vehicle and allow it to idle for one minute.
2. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0138 or P0140 resets, see «DIAGNOSIS & REPAIR PROCEDURE»(ref-158406-S29541930082003121100000).
3. If DTCs are not set, check completion status of HO2S monitoring test in READINESS TESTS mode. If testing has not been completed, check vehicle condition (environmental) and repeat «DTC CONFIRMATION TEST»(ref-158406-S05403609232003121100000).

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Start engine and allow it to reach normal operating temperature. Race engine speed up to 2000 RPM for 60 seconds. While revving engine 5 or 6 times, observe on scan tool HO2S-2 values. If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, go to next step. If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, go to step 4.
3. Turn ignition switch to LOCK position. Disconnect HO2S-2 4-pin harness connector C54, located between exhaust manifold and front catalytic converter. see scheme 4 Start engine and allow it to reach normal operating temperature. Race engine speed up to 2000 RPM for 60 seconds. While revving engine 5 or 6 times, measure voltage between HO2S-2 pigtail connector terminals No. 1 and 2 (component side). (Scheme 37) If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, replace HO2S-2. See «HEATED OXYGEN SENSORS NO. 1 & 2»(ref-157824-S30075854052003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. If HO2S-2 voltage does not deflect from below 0.3 volt to over 0.6 volt, check for open or short circuit in Red/Green wire and Gray/Yellow wire between ECM and HO2S-12. If open or short circuit is found, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41067606202003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S41067606202003092400000).
4. Race engine speed up to 2000 RPM for 60 seconds. Reduce engine speed. With engine idling and using scan tool, check short term fuel trim value. If value is between -20 and +20 percent, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If value is not between -20 and +20 percent, perform diagnose and repair procedure for «DTC P0171 OR DTC P0172»(ref-158406-S10593180092003092400000). After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41067606202003092400000).

Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is at least 1/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Drive vehicle at speeds of 35 MPH or more for 2 minutes or more. Stop vehicle and allow it to idle for one minute. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0171 or P0172 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. If on DTC confirmation test procedure any other DTC than fuel system (P0171 or P0172) were retrieved, perform appropriate diagnose test procedure. See «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) . If no other DTCs are retrieved, go to next step.
3. Check intake system and exhaust system for leakage, If intake system and exhaust system are okay, go to next step. If intake system and exhaust system are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) .
4. Check system fuel pressure. See «FUEL PRESSURE»(ref-157312-S23533648132003080800000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) .
5. Check fuel injectors. See «FUEL INJECTORS»(ref-158706-S07976492952003101500000) under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. If fuel injectors are okay, go to next step. If fuel injectors are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) .
6. Check fuel level sensor referring to «DTC P0461: FUEL LEVEL SENSOR CIRCUIT - RANGE/PERFORMANCE»(ref-158406-S30403502562003092400000) . If fuel level sensor is okay, go to next step. If fuel level sensor is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) .
7. Check MAF sensor referring to «DTC P0101: MASS AIR FLOW SENSOR CIRCUIT - PERFORMANCE»(ref-158406-S21303174532003120200000) . If MAF sensor is okay, go to next step. If MAF sensor is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) .
8. Check ECT sensor referring to «DTC P0116: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - RANGE/PERFORMANCE»(ref-158406-S31720561502003092400000) . If ECT sensor is okay, go to next step. If ECT sensor is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) .
9. Check HO2S-1 referring to «DTC P0131 OR P0132»(ref-158406-S01150340602003092400000) . If HO2S-1 is okay, go to next step. If HO2S-1 is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S20700278102003092400000) .

Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is at least 1/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, retrieve and record current or pending DTC and freeze frame data. See RETRIEVING DIAGNOSTIC TROUBLE CODES and FREEZE FRAME DATA under SELF-DIAGNOSTIC SYSTEM. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Operate vehicle within recorded freeze frame data conditions. Stop vehicle and let it idle for 5 minutes. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0300, P0301, P0302, P0303 or P0304 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Perform ignition system check (spark plugs and ignition spark) referring to «SPARK TEST»(ref-157312-S11017747392003080800000) under IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article. If ignition system is okay, go to next step. If ignition system is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .
3. Check fuel injectors. See «FUEL INJECTORS»(ref-158706-S07976492952003101500000) under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. If fuel injectors are okay, go to next step. If fuel injectors are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .
4. Check system fuel pressure. See «FUEL PRESSURE»(ref-157312-S23533648132003080800000) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .
5. Perform suspect fuel injector check. See «FUEL INJECTORS»(ref-158706-S07976492952003101500000) under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. If fuel injector is okay, go to next step. If fuel injector is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .
6. Perform ignition timing inspection. See «IGNITION TIMING»(ref-157310-S28143868672003080800000) in ON-VEHICLE ADJUSTMENTS article. If ignition timing is as specified, go to next step. If ignition timing is not as specified, adjust timing as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .
7. Perform EGR system inspection. See «EXHAUST GAS RECIRCULATION»(ref-158706-S23070365692003101500000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EGR system is operating properly, go to next step. If EGR system is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .
8. Check fuel level sensor referring to «DTC P0461: FUEL LEVEL SENSOR CIRCUIT - RANGE/PERFORMANCE»(ref-158406-S30403502562003092400000) . If fuel level sensor is okay, go to next step. If fuel level sensor is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .
9. Perform engine mechanical system check. See «MECHANICAL INSPECTION»(ref-157312-S10771087462003080800000) under PRELIMINARY INSPECTION in BASIC DIAGNOSTIC PROCEDURES article. If engine mechanical conditions are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) . If engine mechanical conditions are okay, problem is probably intermittent, check ECM, ignition system and fuel injectors for intermittent open or short circuit. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S21269398972003092400000) .

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and let it idle for 10 seconds. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0327 or P0328 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Locate ECM 26-pin harness connector C51-3 under instrument panel, behind glove box. see scheme 4 Disconnect and check ECM and harness connector C51-3 for poor, loose, corroded or damaged connector terminals. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S02322305252003092400000). If connector terminals are okay, reconnect ECM harness connector. Start engine and allow it to idle. Backprobe and measure voltage between ground and ECM harness connector C51-3 terminal No. 3 (Black wire). (Scheme 38) If voltage is not 0.9-3.98 volts, go to next step. If voltage is 0.9-3.98 volts, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S02322305252003092400000).
3. Turn ignition switch to LOCK position. Disconnect Knock sensor single pin harness connector C70, located on center of cylinder block see scheme 4 Turn ignition switch to ON position. Measure voltage between ground and Knock sensor single wire harness connector C70 (Black wire). (Scheme 38) If voltage is 4-5 volts, replace faulty Knock sensor. See KNOCK SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S02322305252003092400000). If voltage is not 4-5 volts, check for open or short circuit in Black wire between ECM and Knock sensor. If short is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S02322305252003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S02322305252003092400000).

Scheme 38

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. see CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and let it idle for 10 seconds. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0335 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Disconnect ECM 30-pin harness connector C51-2, located under instrument panel, behind glove box. see scheme 4 Check ECM and harness connector for poor, loose, corroded or damaged connector terminals. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S29161332832003092400000). If connector terminals are okay, measure resistance between ECM harness connector C51-2 terminals No. 19 (White/Blue wire) and No. 20 (Orange/Blue wire). (Scheme 28) Resistance should be 484-656 ohms at 68°F (20°C). Also measure resistance between ground and ECM harness connector C51-2 terminals No. 19 (White/Blue wire) and No. 20 (Orange/Blue wire). Resistance should be one k/ohm or more. If any resistance is not as specified, go to next step. If resistances are as specified, go to step 4.
3. Disconnect CKP sensor 3-pin harness connector C57, located on rear of cylinder block, under flywheel see scheme 4 Measure resistance between ground and CKP sensor connector terminals No. 2 and 3 (component side). (Scheme 39) Resistance should be 484-656 k/ohms at 68°F (20°C). If resistance is as specified, repair open or short circuit in White/Black wire or Blue wire between ECM and CKP sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S29161332832003092400000). If resistance is not as specified, replace CKP sensor. See «CRANKSHAFT POSITION SENSOR»(ref-158706-S22791228462003101500000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S29161332832003092400000).
4. Perform a visual inspection of CKP sensor and sensor plate, look for any damage, foreign materials attached and also correct installation. (Scheme 40) If problem is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S29161332832003092400000). If no problem is found, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If no intermittent problem is found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S29161332832003092400000).

Scheme 39

Scheme 40

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC, located below left side of instrument panel. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and keep it running for 1 minute (if engine start). Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0340 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Crank engine and check engine cranking speed. If engine cranking speed is okay, go to next step. If engine cranking speed is to slow or engine will not crank, see GENERATORS & REGULATORS in appropriate STARTING & CHARGING article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000).
3. Turn ignition switch to ON position. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If starting signal circuit DTC P0616 or P0617 is not set, go to next step. If starting signal circuit DTC P0616 or P0617 is set. See «DTC P0616: STARTER RELAY CIRCUIT - LOW INPUT»(ref-158406-S27952047402003121200000) or «DTC P0617: STARTER RELAY CIRCUIT - HIGH INPUT»(ref-158406-S26078792942003121200000). After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000).
4. Turn ignition switch to LOCK position. Disconnect CMP sensor 3-pin harness connector C09, located on rear of cylinder head. see scheme 4 Check CMP sensor harness connector terminals for proper connection. Also check CMP sensor for proper installation. If CMP sensor connection and installation are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000). If CMP sensor connection and installation are okay, turn ignition switch to ON position and measure voltage between CMP sensor harness connector C09 terminals No. 1 (Blue/Black wire) and No. 3 (Purple/Red wire). (Scheme 41) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open or short circuit in Blue/Black wire or Purple/Red wire between ECM and CMP sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000).
5. Ensure ignition switch is in ON position. Measure voltage between CMP sensor harness connector C09 terminals No. 2 (Yellow/Blue wire) and No. 3 (Purple/Red wire). (Scheme 41) If voltage is 4-5 volts, go to next step. If voltage is not 4-5 volts, check for open or short circuit in Yellow/Blue wire between ECM and CMP sensor. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000).
6. Turn ignition switch to LOCK position. Remove CMP sensor. See «CAMSHAFT POSITION SENSOR»(ref-157824-S31808660212003082700000) under ENGINE SENSORS & SWITCHES in REMOVAL & INSTALLATION article. Connect harness connector to removed CMP sensor. Disconnect ignition coil and fuel injectors harness connector. For components location see scheme 4 Turn ignition switch to ON position. While rotating CMP sensor coupling (Scheme 42), backprobe and measure voltage between ECM 30-pin harness connector C51-2 terminal No. 26 (Yellow/Blue wire) and ECM 26-pin harness connector C51-23 terminal No. 26 (Purple/Red wire). (Scheme 28) If voltage vary from 0-6 volts, or from 6-0 volts, go to next step. If voltage does not vary from 0-6 volts, or from 6-0 volts, replace CMP sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000).
7. Turn ignition switch to LOCK position. Remove signal rotor cover from CMP sensor. (Scheme 43) Check CMP sensor signal rotor for damage or contamination. If CMP sensor signal rotor is faulty, replace CMP sensor. If CMP sensor signal rotor is okay, check for intermittent problem. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If intermittent problem is found, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000). If no intermittent problem is found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S31590026552003092400000).

Scheme 41

Scheme 42

Scheme 43

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at 35-40 MPH for 7 minutes. Increase vehicle speed at 60-70 MPH, then let it coast and stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0401 or P0402 resets, see DIAGNOSIS & REPAIR PROCEDURE. If no DTC is retrieved, using scan tool, check if EGR system monitoring test has completed. If EGR system monitoring test has completed, see DIAGNOSIS & REPAIR PROCEDURE. If EGR system monitoring test has not completed, check environmental conditions and repeat DTC CONFIRMATION TEST.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. If DTC P0403 was not retrieved along with DTCs P0401 or P0402, go to next step. If DTC P0403 was retrieved along with DTCs P0401 or P0402. See «DTC P0403: EGR FLOW MALFUNCTION»(ref-158406-S23073850352003092400000) SELF-DIAGNOSTIC SYSTEM.
3. If SUZUKI scan tool or equivalent is available, go to next step. If SUZUKI scan tool or equivalent is not available, go to step 6.
4. Turn ignition switch to ON position. Using scan tool, check EGR system. See «EXHAUST GAS RECIRCULATION»(ref-158706-S23070365692003101500000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EGR system is operating properly, go to next step. If EGR system is not operating properly, go to step 6.
5. Turn ignition switch to LOCK position. Perform MAP sensor component test. See «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-158706-S42930731892003101500000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If MAP sensor is faulty, repair or replace as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000). If MAP sensor is okay, check for intermittent problem. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If intermittent problem is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000). If intermittent problem is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000).
6. Turn ignition switch to LOCK position. Disconnect EGR valve 6-pin harness connector C04. see scheme 4 Turn ignition switch to ON position. Measure voltage between ground and EGR valve harness connector C04 terminals No. 2 and 5 (Blue/Black wire). (Scheme 44) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open circuit in Blue/Black wire between EGR valve and main relay. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000).
7. Turn ignition switch to LOCK position. Connect EGR harness connector and disconnect ECM harness connectors C51-3 and C51-2. see scheme 4 Turn ignition switch to ON position. Measure resistance between ECM harness connectors C51-3 terminal No. 4 (Blue/Black wire) and ECM harness connector C51-2 terminals No. 13 (Green/Red wire), No. 14 (Light Green/Yellow wire), No. 15 (Light Green/White wire) and No. 16 (Light Green wire). (Scheme 28) If all resistances are 20-24 ohms, go to next step. If any resistance is not 20-24 ohms, check for open or short circuit in appropriate wire between EGR valve and ECM. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000).
8. Ensure ignition switch is in LOCK position. Perform MAP sensor component test. See «MANIFOLD ABSOLUTE PRESSURE SENSOR»(ref-158706-S42930731892003101500000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If MAP sensor is faulty, repair or replace as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000). If MAP sensor is okay, check EGR valve and EGR passage for clog. If clogged passage is found or EGR valve is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000). If clogged passage or EGR valve are okay, check for intermittent problem. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If intermittent problem is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000). If no intermittent problem is found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S37626080802003092400000).

Scheme 44

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 10 seconds. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0403 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition to LOCK position. Disconnect EGR valve 6-pin harness connector, located at rear of intake manifold. see scheme 4 Check EGR valve connector for contamination and poor terminal contact. (Scheme 44) If contamination or poor terminal contact is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S09818316592003092400000). If contamination or poor terminal contact is not found, perform EGR valve component test. See «EXHAUST GAS RECIRCULATION»(ref-158706-S23070365692003101500000) under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S09818316592003092400000).
3. Reconnect EGR valve harness connector. Locate and disconnect ECM harness connector under instrument panel, behind glove box. see scheme 4 Disconnect ECM harness connectors C51-2 and C51-3 and measure resistance between specified ECM harness connectors and terminals. Resistance should be 20-24 ohms at 68°F (20°C). Also measure resistance between ground and ECM harness connector C51-2 specified terminals. See «CHECKING EGR VALVE SYSTEM CIRCUITS RESISTANCE»(ref-158406-S02845797482003102100000) table. (Scheme 28) If all resistances are as specified, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If resistance is not as specified, repair open or short to ground in appropriate circuit. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S09818316592003092400000). CHECKING EGR VALVE SYSTEM CIRCUITS RESISTANCE Measure Between ECM Harness Connector/Terminal (Wire Color) Measure Between ECM Harness Connector/Terminal (Wire Color) C51-2/13 (Light Green/Red) C51-3/4 (Blue/Black) C51-2/14 (Green/Yellow) C51-3/4 (Blue/Black) C51-2/15 (Light Green/White) C51-3/4 (Blue/Black) C51-2/16 (Light Green) C51-3/4 (Blue/Black) C51-2/13 (Light Green/Red) Ground C51-2/14 (Green/Yellow) Ground C51-2/15 (Light Green/White) Ground C51-2/16 (Light Green) Ground

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is 1/4 full or more, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and drive vehicle at 50-56 MPH for 5 minutes. (throttle valve opening should be kept constant). Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0420 resets, see DIAGNOSIS & REPAIR PROCEDURE. If no DTC is retrieved, using scan tool, check if catalyst monitoring test has completed. If catalyst monitoring test has completed, see DIAGNOSIS & REPAIR PROCEDURE. If catalyst monitoring test has not completed, check environmental conditions and repeat DTC CONFIRMATION TEST.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Perform exhaust system visual inspection (leaks, damage and loose connection). If exhaust system is okay, go to next step. If exhaust system is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S03245203542003092400000) .
3. Check output voltage of HO2S-2 referring to «DTC P0138 OR P0140»(ref-158406-S25868815792003121100000) . If diagnostic procedure results are okay, replace TWC. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S03245203542003092400000) . If diagnostic procedure results are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S03245203542003092400000) .

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is 1/4 full or more, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and drive vehicle at 35 MPH or more for 20 minutes. Stop vehicle and let engine idle for 1 minute or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0441 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Check EVAP system vacuum hoses for proper connection, leakage, plugging or deterioration. If vacuum hoses are okay, go to next step. If vacuum hoses are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S38832284782003121800000) .
3. Check EVAP-CPP circuit. See «EVAP CANISTER PURGE VALVE CIRCUIT»(ref-158706-S20897187622003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister purge valve circuit is okay, go to next step. If EVAP canister purge valve circuit is faulty, go to step 5 .
4. Check EVAP canister for damage. See «EVAP CANISTER»(ref-158706-S23277663242003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister is okay, go to next step. If EVAP canister is faulty, replace EVAP canister and repeat «DTC CONFIRMATION TEST»(ref-158406-S38832284782003121800000) .
5. Perform EVAP-CPV component test. See «EVAP CANISTER PURGE VALVE»(ref-158706-S27819432102003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV is faulty, replace EVAP-CPV and repeat «DTC CONFIRMATION TEST»(ref-158406-S38832284782003121800000) . If EVAP-CPV is okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S38832284782003121800000) .

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at 35 MPH or more for 20 minutes (throttle valve opening should be kept constant for the last three minutes). Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0442 or P0455 resets, see DIAGNOSIS & REPAIR PROCEDURE. If no DTC is retrieved, using scan tool, check if EVAP system monitoring test has completed. If EVAP system monitoring test has completed, see DIAGNOSIS & REPAIR PROCEDURE. If EVAP system monitoring test has not completed, check environmental conditions and repeat DTC CONFIRMATION TEST.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition to LOCK position. Check fuel filler cap for proper installation, and cap gasket for deterioration. If fuel filler cap is okay, go to next step. If fuel filler cap is faulty, tighten or replace fuel filler cap. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
3. Check EVAP system vacuum hoses for proper connection, leakage, plugging or deterioration. If vacuum hoses are okay, go to next step. If vacuum hoses are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
4. Check EVAP-CPV circuit. See «EVAP CANISTER PURGE VALVE CIRCUIT»(ref-158706-S20897187622003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV circuit is okay, go to next step. If EVAP-CPV circuit is faulty, go to step 12 .
5. Check EVAP-CVV circuit. See «EVAP CANISTER VENT VALVE CIRCUIT»(ref-158706-S42577221552003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CVV circuit is okay, go to next step. If EVAP-CVV circuit is faulty, go to step 13 .
6. Perform Fuel Tank Pressure Control (FPCV) valve component test. See «FUEL TANK PRESSURE CONTROL VALVE»(ref-158706-S14214142752003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FPCV is okay, go to next step. If FPCV is faulty, replace fuel tank pressure control valve and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
7. Check EVAP canister for damage. See «EVAP CANISTER»(ref-158706-S23277663242003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister is okay, go to next step. If EVAP canister is faulty, replace EVAP canister and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
8. Check fuel tank, purge line and EVAP system components for leakage. See «EVAP SYSTEM LEAKAGE CHECK»(ref-158706-S30292347652003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. For vacuum hose locations, see appropriate vacuum diagram in «VACUUM DIAGRAMS»(ref-159421) article. If EVAP system components are okay, go to next step. If EVAP system leak is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
9. Perform EVAP system smoke test. See «EVAP SYSTEM SMOKE TEST»(ref-158706-S32244633502003121000000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP system is okay, go to next step. If EVAP system is faulty, replace faulty part and repeat step 3 .
10. Perform FTP sensor component test. See «FUEL TANK PRESSURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP sensor is okay, go to next step. If FTP sensor is faulty, replace FTP sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
11. Check fuel level sensor and circuit referring to «DTC P0461: FUEL LEVEL SENSOR CIRCUIT - RANGE/PERFORMANCE»(ref-158406-S30403502562003092400000) . If diagnostic procedure results are okay, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) . If diagnostic procedure results are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
12. Perform EVAP-CPV component test. See «EVAP CANISTER PURGE VALVE»(ref-158706-S27819432102003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV is faulty, replace EVAP-CPV. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) . If EVAP-CPV is okay, check EVAP-CPV circuits for open or short in Blue/Black wire and Green/Black wire between EVAP-CPV and ECM. If short or open circuit is found, repair as necessary. If short or open circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .
13. Perform EVAP-CVV component test. See «EVAP CANISTER VENT VALVE»(ref-158706-S04190796252003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CVV is faulty, replace EVAP-CVV. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) . If EVAP-CVV is okay, check EVAP-CVV circuits for open or short in Blue/Black wire and Purple/Red wire between EVAP-CVV and ECM. If short or open circuit is found, repair as necessary. If short or open circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for one minute with all electric loads OFF. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0443 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Perform EVAP-CPV component test. See «EVAP CANISTER PURGE VALVE»(ref-158706-S27819432102003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV is faulty, replace EVAP-CPV. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) . If EVAP-CPV is okay, check for open or short CIRCUIT in Blue/Black wire and Green/Black wire between EVAP canister purge valve and ECM. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) . If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S42170487132003092400000) .

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and drive vehicle at 30-40 MPH until engine reaches 158°F (70°C) or higher. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0446 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Check EVAP-CVV circuit. See «EVAP CANISTER VENT VALVE CIRCUIT»(ref-158706-S42577221552003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CVV circuit is okay, go to next step. If EVAP canister vent valve circuit is faulty, go to step 5 .
3. Check EVAP canister for damage. See «EVAP CANISTER»(ref-158706-S23277663242003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister is okay, go to next step. If EVAP canister is faulty, replace EVAP canister and repeat «DTC CONFIRMATION TEST»(ref-158406-S09693475222003121900000) .
4. Check EVAP canister air suction filter and passage for damage or clog. See «EVAP CANISTER AIR SUCTION FILTER»(ref-158706-S27819005802003103000000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP canister suction filter is faulty, repair or replace as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S09693475222003121900000) . If EVAP canister suction filter is okay, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S09693475222003121900000) .
5. Perform EVAP-CVV component test. See «EVAP CANISTER VENT VALVE»(ref-158706-S04190796252003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CVV is faulty, replace vent valve. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S09693475222003121900000) . If EVAP-CVV is okay, check open or short circuit in Blue/Black wire between ECM and EVAP-CVV. Also check open or short circuit in Purple/Red wire between ECM and EVAP-CVV. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S09693475222003121900000) . If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S09693475222003121900000) .

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for 3 minute or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0449 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. If using scan tool, go to next step. If not using scan tool, locate ECM 30-pin harness connector C51-2 under instrument panel, behind glove box. see scheme 4 Check ECM connector for contamination and poor terminal contact. If contamination or poor terminal contact is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S41696601232003122200000). If contamination or poor terminal contact is not found, turn ignition switch to ON position and measure voltage between ground and ECM harness connector C51-2 terminal No. 5 (Purple/Red wire). (Scheme 28) If voltage is not 10-14 volts, go to next step. If voltage is 10-14 volts, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41696601232003122200000).
3. Ensure ignition switch is in ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. While turning EVAP-CVV ON and OFF with scan tool, measure voltage between ground and ECM harness connector C51-2 terminal No. 5 (Purple/Red wire). (Scheme 28) Voltage should be 10-14 volts when EVAP-CVV is turned ON, and 0-1 volt when EVAP-CVV is turned OFF. If voltage is not as specified, go to next step. If voltage is as specified, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41696601232003122200000).
4. Turn ignition switch to LOCK position. Perform EVAP-CVV component test. See «EVAP CANISTER VENT VALVE»(ref-158706-S04190796252003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CVV is faulty, replace vent valve. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S41696601232003122200000). If EVAP-CVV is okay, check open or short circuit in Blue/Black wire between ECM and EVAP-CVV. Also check open or short circuit in Purple/Red wire between ECM and EVAP-CVV. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S41696601232003122200000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S41696601232003122200000).

Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is 1/4-3/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at 35 MPH or more for 20 minutes, then keep vehicle speed at 30-35 MPH for 3 minutes (throttle valve opening should be kept constant). Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0451 resets, see DIAGNOSIS & REPAIR PROCEDURE. If no DTC is retrieved, using scan tool, check if EVAP system monitoring test has completed. If EVAP system monitoring test has completed, see DIAGNOSIS & REPAIR PROCEDURE. If EVAP system monitoring test has not completed, check environmental conditions and repeat DTC CONFIRMATION TEST.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Remove FTP sensor from fuel tank. See «FUEL TANK PRESSURE SENSOR»(ref-157824-S32282777932003082700000) under FUEL SYSTEM in REMOVAL & INSTALLATION article. Check FTP sensor vent hole and pressure passage for plugging. If no problem is found, go to next step. If problem is found, repair or replace as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S31028238432003092400000) .
3. Perform FTP sensor component test. See «FUEL TANK PRESSURE & TEMPERATURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP sensor is faulty, replace FTP sensor and repeat «DTC CONFIRMATION TEST»(ref-158406-S31028238432003092400000) . If FTP sensor is okay, check for high resistance in wires between ECM and FTP sensor. If any wire resistance is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S31028238432003092400000) . If all wires resistances are okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S31028238432003092400000) .

Ensure intake air temperature is 18°F (-8°C) or more, vehicle is at an altitude of 8000 feet or below, engine coolant temperature is at 18-230°F (-8-110°C), fuel tank is 1/4-3/4 full, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at 30-40 MPH or more for 2 minutes (throttle valve opening should be kept constant). Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0452 or P0453 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. If using scan tool, go to next step. If not using scan tool, open fuel filler cup. Locate ECM 35-pin harness connector E61 under instrument panel, behind glove box. see scheme 4 Turn ignition to ON position. Backprobe and measure voltage between ground and ECM harness connector E61 terminal No. 27 (Brown/Red wire). (Scheme 28) If voltage is not 2-3 volts, go to step 4. If voltage is 2-3 volts, go to step 5.
3. Turn ignition switch to LOCK position. Open fuel filler cup and turn ignition switch to ON position. Using scan tool, check fuel tank pressure. If fuel pressure displayed on scan tool is not zero kPa, go to next step. If fuel pressure displayed on scan tool is zero kPa, go to step 6.
4. Turn ignition switch to LOCK position.Perform FTP sensor component test. See «FUEL TANK PRESSURE & TEMPERATURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP sensor is faulty, replace FTP sensor and repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000). If FTP sensor is okay, check for open or short circuit in wires between ECM and FTP sensor. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000). If open or short circuit is not found, replace FTP sensor. See «FUEL TANK PRESSURE SENSOR»(ref-157824-S32282777932003082700000) under FUEL SYSTEM in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000).
5. Turn ignition switch to LOCK position. Check ECM harness connector E61 for contamination and poor terminal contact. If contamination or poor terminal contact is not found, go to next step. If contamination or poor terminal contact is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000).
6. Check for damage or clog at EVAP canister, EVAP canisters suction filter and passage, and Fuel vapor passage between fuel tank and EVAP canister. If damage or clog is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000). If damage or clog is found, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000).

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at 35 MPH or more for 20 minutes (throttle valve opening should be kept constant for the last three minutes). Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0456 resets, see DIAGNOSIS & REPAIR PROCEDURE. If no DTC is retrieved, using scan tool, check if EVAP system monitoring test has completed. If EVAP system monitoring test has completed, see DIAGNOSIS & REPAIR PROCEDURE. If EVAP system monitoring test has not completed, check environmental conditions and repeat DTC CONFIRMATION TEST.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition to LOCK position. Check fuel filler cap for proper installation, and cap gasket for deterioration. If fuel filler cap is okay, go to next step. If fuel filler cap is faulty, tighten or replace fuel filler cap as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S06505174612003122200000) .
3. Perform EVAP system components leakage check. See «EVAP SYSTEM LEAKAGE CHECK»(ref-158706-S30292347652003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. For vacuum hose locations, see appropriate vacuum diagram in «VACUUM DIAGRAMS»(ref-159421) article. If any EVAP system component leak is found, go to next step. If EVAP system leak is not found, tighten or replace fuel filler cap. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S06505174612003122200000) .
4. Perform EVAP system smoke test. See «EVAP SYSTEM SMOKE TEST»(ref-158706-S32244633502003121000000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP system is okay, go to next step. If EVAP system is faulty, repair as necessary and repeat step 3 .
5. Perform EVAP-CPV component test. See «EVAP CANISTER PURGE VALVE»(ref-158706-S27819432102003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV is okay, go to next step. If EVAP-CPV is faulty, replace EVAP-CPV. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S06505174612003122200000) .
6. Perform EVAP-CVV component test. See «EVAP CANISTER VENT VALVE»(ref-158706-S04190796252003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CVV is okay, go to next step. If EVAP-CVV is faulty, replace EVAP-CVV. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S06505174612003122200000) .
7. Turn ignition switch to LOCK position.Perform FTP sensor component test. See «FUEL TANK PRESSURE & TEMPERATURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP sensor is okay, go to next step. If FTP sensor is faulty, replace FTP sensor. See «FUEL TANK PRESSURE SENSOR»(ref-157824-S32282777932003082700000) under FUEL SYSTEM in REMOVAL & INSTALLATION article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000) .
8. Check fuel level sensor and circuit referring to «DTC P0461: FUEL LEVEL SENSOR CIRCUIT - RANGE/PERFORMANCE»(ref-158406-S30403502562003092400000) . If diagnostic procedure results are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000) . If diagnostic procedure results are okay, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37847996862003092400000) .

DTC confirmation test is included in the diagnosis and repair procedure. See DIAGNOSIS & REPAIR PROCEDURE .

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0463 is not retrieved along with P0461, go to next step. If DTC P0463 is retrieved along with P0461, perform diagnose and repair procedure for P0463 first. See «DTC P0463: FUEL LEVEL SENSOR CIRCUIT - HIGH INPUT»(ref-158406-S32721659752003092400000).
3. Turn ignition switch to LOCK position. If SUZUKI scan tool or equivalent is not used for this test procedure, go to next step. If SUZUKI scan tool or equivalent is used for this test procedure, go to step 5.
4. Turn ignition switch to LOCK position. Locate ECM 35-pin harness connector E61 under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. Backprobe and measure voltage between ground and ECM harness connector E61 terminal No. 28 (Blue/White wire). (Scheme 28) Record measured voltage. Add one gallon (3.7L) of fuel to fuel tank and measure voltage at same harness connector terminal and record measured voltage. If second voltage reading is higher than first voltage reading, go to step 6. If second voltage reading is lower than first voltage reading, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, retest system for normal operation.
5. Turn ignition switch to ON position. Using scan tool check and record FUEL LEVEL parameter. Add one gallon (3.7L) of fuel to fuel tank, recheck and record FUEL LEVEL parameter. If FUEL LEVEL parameter does not increase, go to next step. If FUEL LEVEL parameter increases, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, retest system for normal operation.
6. Turn ignition switch to LOCK position. Disconnect fuel level sensor in-line harness connector L15-R01. (Scheme 45) Check fuel level sensor in-line harness connector for contamination and poor terminal contact. If contamination or poor terminal contact is found, repair as necessary and retest system for normal operation. If contamination or poor terminal contact is not found, while adding one gallon (3.7L) of fuel to fuel tank, measure resistance between ground and fuel level sensor in-line harness connector R01 terminal No. 4 (Blue/White wire). (Scheme 46) If resistance decreases smoothly within a 2-130 ohms range, go to next step. If resistance does not decrease, or resistance is out of range, check for open or short circuit in Blue/White wire between fuel level sensor, fuel level gauge and ECM. Also check for open or short circuit in Black/Yellow wire between fuel level sensor and ground. If open or short circuit is found, repair as necessary and retest system for normal operation. If open or short circuit is not found, replace fuel level sensor. After repair, retest system for normal operation.
7. Reconnect ECM harness connector. Ensure in-line fuel level sensor harness connector still disconnected. Turn ignition switch to ON position, and observe fuel gauge. Fuel gauge should read empty "E". Turn ignition switch to LOCK position. Connect fused jumper wire ground and in-line fuel level sensor harness connector L15 terminal No. 4 (Blue/White wire). (Scheme 46) Turn ignition switch to ON position and observe fuel gauge. Now fuel gauge should read full "F". If fuel gauge readings are as specified, substitute ECM with a known good unit and retest system for normal operation. If fuel gauge readings are not as specified, check for open or short circuit in Blue/White wire between fuel level sensor, fuel level gauge and ECM. If open or short circuit is found, repair as necessary and retest system for normal operation. If open or short circuit is not found, replace fuel level sensor and retest system for normal operation.

Scheme 45

Scheme 46

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for one minute. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0463 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Check position of combination meter fuel indicator. If combination meter indicates fuel in fuel tank, go to next step. If combination meter indicates "E" (empty), add fuel to fuel tank and go to next step.
3. Turn ignition switch to LOCK position. Locate ECM 35-pin harness connector E61 under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. Backprobe and measure voltage between ground and ECM harness connector E61 terminal No. 28 (Blue/White wire) (Scheme 28) If voltage is about 7.1 volts or more, go to next step. If voltage is less than 7.1 volts, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000).
4. If voltage reading in step 3 was not 9-14 volts, go to next step. If voltage reading in step 3 was 9-14 volts, check for open or short circuit in Blue/White wire between fuel level sensor, fuel level gauge and ECM. If open or short circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000). If open or short circuit is not found, replace fuel gauge. See COMBINATION METER under REMOVAL & INSTALLATION in INSTRUMENT PANELS - GRAND VITARA, VITARA & XL7 article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000).
5. Turn ignition switch to LOCK position. Disconnect fuel level sensor in-line 12-pin harness connector L15-R01. (Scheme 45) Check fuel level sensor in-line harness connector for contamination and poor terminal contact. If contamination or poor terminal contact is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000). If contamination or poor terminal contact is not found, measure resistance between fuel level sensor in-line harness connector R01 terminals No. 3 (Black/Yellow wire) and No. 4 (Blue/White wire). See «FUEL LEVEL SENSOR RESISTANCE»(ref-158406-S17441158112003092400000) table. (Scheme 46) If resistances are as specified, check for open or short circuit in Blue/White wire between ECM and fuel level sensor, or in Black/Yellow wire between fuel level sensor and ground. If open or short circuit is found, repair a necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000). FUEL LEVEL SENSOR RESISTANCE Fuel Level Ohms Empty 90-130 Half 32.5 Full 1-10 If any resistance is not as specified, check for open or short circuit in Blue/White wire between ECM and fuel level sensor, or short circuit in Black/Yellow wire between fuel level sensor and ground. If open or short circuit is found, repair a necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000). If open or short circuit is not found, replace fuel gauge. See COMBINATION METER under REMOVAL & INSTALLATION in INSTRUMENT PANELS - GRAND VITARA, VITARA & XL7 article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000).

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for one minute. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0464 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Perform intermittent test procedure. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If an intermittent problem is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S06082749192003092400000). If an intermittent problem is not found, check for current or pending DTC using scan tool. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P0464 resets, go to next step. If DTC P0464 does not resets, problem was intermittent, no more diagnostic is necessary.
3. Turn ignition switch to LOCK position. Disconnect fuel level sensor in-line 12-pin harness connector L15-R01. (Scheme 45) Check fuel level sensor in-line harness connector for contamination and poor terminal contact. If contamination or poor terminal contact is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S33119329402003122300000). If contamination or poor terminal contact is not found, measure resistance between fuel level sensor in-line harness connector R01 terminals No. 3 (Black/Yellow wire) and No. 4 (Blue/White wire). See «FUEL LEVEL SENSOR RESISTANCE»(ref-158406-S09180137052003122300000) table. (Scheme 46) If resistances are as specified, check for open or short circuit in Blue/White wire between ECM and fuel level sensor, or in Black/Yellow wire between fuel level sensor and ground. If open or short circuit is found, repair a necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S33119329402003122300000). If open or short circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S33119329402003122300000). FUEL LEVEL SENSOR RESISTANCE Fuel Level Ohms Empty 90-130 Half 32.5 Full 1-10 If any resistance is not as specified, check for open or short circuit in Blue/White wire between ECM and fuel level sensor, or short circuit in Black/Yellow wire between fuel level sensor and ground. If open or short circuit is found, repair a necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S33119329402003122300000). If open or short circuit is not found, replace fuel gauge. See COMBINATION METER under REMOVAL & INSTALLATION in INSTRUMENT PANELS - GRAND VITARA, VITARA & XL7 article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S33119329402003122300000).

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at 35 MPH or more for 20 minutes (throttle valve opening should be kept constant for the last three minutes). Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0496 resets, see DIAGNOSIS & REPAIR PROCEDURE. If no DTC is retrieved, using scan tool, check if EVAP system monitoring test has completed. If EVAP system monitoring test has completed, see DIAGNOSIS & REPAIR PROCEDURE. If EVAP system monitoring test has not completed, check environmental conditions and repeat DIAGNOSIS & REPAIR PROCEDURE.

Note. Fuel tank pressure sensor and fuel temperature sensor are built as a single unit (assembly), and is located on fuel tank.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position.Check EVAP-CPV circuit. See «EVAP CANISTER PURGE VALVE CIRCUIT»(ref-158706-S20897187622003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV circuit is okay, go to next step. If EVAP-CPV circuit is faulty, go to step 4 .
3. Perform FTP sensor component test. See «FUEL TANK PRESSURE & TEMPERATURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP sensor is faulty, replace FTP sensor and repeat «DTC CONFIRMATION TEST»(ref-158406-S16012471122003122300000) . If FTP sensor is okay, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S16012471122003122300000) .
4. Perform EVAP-CPV component test. See «EVAP CANISTER PURGE VALVE»(ref-158706-S27819432102003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If EVAP-CPV is faulty, replace EVAP-CPV. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S16012471122003122300000) . If EVAP-CPV is okay, check for open or short circuit in Blue/Black wire between EVAP-CPV and main relay. Also in Green/Black wire between EVAP-CPV and ECM. If short or open circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S16012471122003122300000) . If short or open circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S16012471122003122300000) .

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature. Drive vehicle at 60-70 MPH. Release accelerator pedal and let vehicle coast. Stop vehicle. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0500 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Drive vehicle and check speedometer for vehicle speed indication. If speedometer indicates vehicle speed, go to next step. If speedometer does not indicates vehicle speed, turn ignition switch to LOCK position and check for open circuit in Blue/Yellow wire between ECM and VSS. If open circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000). If open circuit is not found, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000).
3. Ensure ignition switch is in LOCK position. Disconnect VSS 3-pin harness connector C20, located in transmission extension case. see scheme 4 Turn ignition switch to ON position. Measure voltage between VSS harness connector C20 terminals No. 2 (Black/Yellow wire) and No. 3 (Blue/Black wire). (Scheme 47) If voltage is 10-14 volts, go to next step. If voltage is not 10-14 volts, repair open or short circuit in Black/Yellow wire between ground and VSS, or in Blue/Black wire between ECM and VSS. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000).
4. Ensure ignition switch is in ON position. Measure voltage between VSS harness connector C20 terminals No. 1 (Blue/Yellow wire) and No. 2 (Black/Yellow wire). If voltage is approximately 4 volts, go to next step. If voltage is not approximately 4 volts, go to step 6.
5. Turn ignition switch to LOCK position. Perform VSS visual inspection, also perform VSS component test. See «VEHICLE SPEED SENSOR»(ref-158706-S01285951042003101500000) under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If VSS is faulty, replace VSS. If VSS is okay, check VSS connector for poor, loose, corroded or damaged connector terminals. If connector terminals are faulty, repair as necessary and «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000). If connector terminals are okay, substitute VSS with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000).
6. Turn ignition switch to LOCK position. Disconnect combination meter 16-pin harness connector G11, located behind instrument cluster. see scheme 4 Turn ignition switch to ON position. Measure voltage between VSS harness connector C20 terminals No. 1 (Blue/Yellow wire) and No. 2 (Black/Yellow wire). (Scheme 47) If voltage is not approximately 4 volts, go to next step. If voltage is approximately 4 volts, replace VSS and repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000).
7. Turn ignition switch to LOCK position. Disconnect cruise control module 12-pin harness connector E132, located in left rear of engine compartment. Turn ignition switch to ON position and measure voltage between VSS harness connector C20 terminals No. 1 (Blue/Yellow wire) and No. 2 (Black/Yellow wire). (Scheme 47) If voltage is approximately 4 volts, replace cruise control module and repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000). If voltage is not approximately 4 volts, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000).

Scheme 47

Ensure intake air temperature is 18°F (-8°C) or more, engine coolant temperature is 18-230°F (-8-110°C), vehicle is at an altitude of 8000 feet or below, and barometric pressure is 75 kPa or more. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature and let it idle for one minute. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0506 or P0507 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Perform IAC valve system check. See «IDLE AIR CONTROL VALVE SYSTEM CHECK»(ref-158706-S21641208112003101500000) under IDLE CONTROL SYSTEM in SYSTEM & COMPONENT TESTING article. If IAC valve system is faulty, go to next step. If IAC valve system is okay, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37737989472003092400000).
3. Perform IAC valve component test. See «IDLE AIR CONTROL VALVE»(ref-158706-S30889331512003101500000) under IDLE CONTROL SYSTEM in SYSTEM & COMPONENT TESTING article. If IAC valve is faulty, go to next step. If IAC valve is okay, go to step 7.
4. Turn ignition switch to LOCK position. Disconnect ECM 30-pin harness connector C51-2, located under instrument panel, behind glove box. see scheme 4 Check ECM and harness connector for poor, loose, corroded or damaged connector terminals. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S37737989472003092400000). If connector terminals are okay, measure resistance between ECM harness connector C51-2 terminals No. 3 (Light Green/Black wire) and No. 12 (Purple/Black wire). Also measure resistance between ECM harness connector C51-2 terminals No. 10 (Purple/Yellow wire) and No. 11 (Gray/Blue wire). (Scheme 28) If resistances are 70-86 ohms, go to next step. If any resistance is not 70-86 ohms, check for open or short circuit in Light Green/Black wire, Purple/Black wire, Purple/Yellow wire, or Gray/Blue wire between ECM and IAC valve. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37737989472003092400000).
5. Check for continuity between ground ECM harness connector C52-2 terminals No. 3 (Light Green/Black wire), No. 10 (Purple/Yellow wire), No. 11 (Gray/Blue wire) and No. 12 (Purple/Black wire). (Scheme 28) If continuity is not found, go to next step. If any continuity is found, repair short to ground in appropriate circuit between ECM and IAC valve. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37737989472003092400000).
6. Reconnect ECM and IAC valve harness connectors. Turn ignition switch to ON position. Backprobe and measure voltage between ground and IAC valve 6-pin harness connector C29 and terminals No. 2 (Blue/Black wire) and No. 5 (Blue/Black wire). (Scheme 48) If voltage is 10-14 volts, substitute IAC valve or ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000). If voltage is not 10-14 volts, repair open circuit in Blue/Black wire between AIC valve and main relay. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37737989472003092400000).
7. If idle speed as tested in step 2 was higher than specified, check for vacuum leaks from intake manifold, throttle body, PCV valve and EVAP canister purge control system. If problem is found, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37737989472003092400000). If idle speed as tested in step 2 was not higher than specified, go to next step.
8. Check components or parts that could cause low idle, check following: Stuck fast idle air valve. Air leak between MAF sensor and throttle body. Clogged idle air passages. Overheated engine. High accessory engine load. Engine mechanical failure. If problem is found, repair as necessary. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S37737989472003092400000). If DTC does not reset, testing is complete.

Scheme 48

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature and let it idle for one minute. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0601 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Perform DTC CONFIRMATION TEST . If DTC P0601 is set, replace ECM and go to DTC CONFIRMATION TEST . If DTC P0601 is not set, problem is intermittent. System is okay at this time. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. After repair, repeat DTC CONFIRMATION TEST .

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature and let it idle for 3 minutes or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0616 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Located ECM under instrument panel, behind glove box. see scheme 4 Turn ignition switch to ON position. Backprobe and measure voltage between ground and ECM 26-pin harness connector C51-3 terminal No. 18 (Black/Yellow wire). (Scheme 28) While cranking engine voltage should be 6-14 volts. If voltage reading is not as specified, go to next step. If voltage reading is as specified, problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S23996245662003092400000).
3. Turn ignition switch to LOCK position. Disconnect ECM harness connectors C51-3. Measure resistance between ECM harness connector C51-3 terminals No. 6 (Black/Orange wire) and No. 18 (Black/Yellow wire). (Scheme 28) If resistance is less than 100 ohms, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S28635634362003123000000). If resistance is not less than 100 ohms, check for open or short circuit in Black/Yellow wire between starter, transmission range switch (A/T) or clutch pedal position switch (M/T) and ECM. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S28635634362003123000000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature and let it idle for one minute. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P0617 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Located ECM under instrument panel, behind glove box. see scheme 4 Start engine and let it idle. Backprobe and measure voltage between ground and ECM 26-pin harness connector C51-3 terminal No. 18 (Black/Yellow wire). (Scheme 28) Voltage should be 0-1 volt. If voltage is not as specified, go to next step. If voltage is as specified, check starter motor. See STARTERS article in ENGINES. If starter motor is faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S25016804602003121200000). If starter motor is okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S25016804602003121200000).
3. Turn ignition switch to LOCK position. Check Black/Yellow wire for short to other circuit(s) between starter, transmission range switch (A/T) or clutch pedal position switch (M/T) and ECM. If short to other circuit(s) is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S25016804602003121200000). If short to other circuit(s) is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S25016804602003121200000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature and let it idle for one minute. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P1510 resets, see DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Located ECM under instrument panel, behind glove box. see scheme 4 Start engine and let it idle. Backprobe and measure voltage between ground and ECM 35-pin harness connector E61 terminal No. 2 (White wire). (Scheme 28) Voltage should be 10-14 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair open or short circuit in White wire between ECM and fuse box. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S33869059942003121500000).
3. Turn ignition switch to LOCK position. Check ECM and harness connector for poor, loose, corroded or damaged connector terminals. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S33869059942003121500000). If connector terminals are okay, check for intermittent problem. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article. If intermittent problem is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S33869059942003121500000). If intermittent problem is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S33869059942003121500000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Ensure engine coolant temperature is less than 86°F (30°C) at start up. Start engine and warm to 176-230°F (80-110°C). Drive vehicle at more than 35 MPH for 3 minutes or more. Stop vehicle and allow engine to idle for 3 minutes or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P2025 resets, go to DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to LOCK position. Disconnect ECM 35-pin harness connector E61, located under instrument panel, under glove box. see scheme 4 Check ECM and harness connector for poor, loose, corroded or damaged connector terminals. If connector terminals are okay, go to next step. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).
3. Measure resistance between ground and ECM harness connector E61 terminal No. 10 (Gray/Green wire). (Scheme 28) If resistance is infinite, go to next step. If resistance is not infinite, repair short to ground in Gray/Blue wire between ECM and fuel tank temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).
4. Turn ignition switch to ON position. Measure voltage between ground and ECM harness connector E61 terminal No. 10 (Gray/Green wire). (Scheme 28) If voltage is zero volts, go to next step. If voltage is not zero volts, repair open or short circuit in Gray/Green wire between ECM and fuel tank temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).
5. Turn ignition switch to LOCK position. Reconnect ECM connectors. Disconnect harness connector between floor and main harness for fuel tank temperature sensor circuit. Turn ignition switch to ON position. Measure voltage between ECM connector E61 terminals No. 10 (Gray/Green wire) and ECM 26-pin harness connector C51-3 terminal No. 21 (Gray/Yellow wire). (Scheme 28) If voltage is 4-5 volts, go to next step. If voltage is not 4-5 volts, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).
6. Turn ignition switch to LOCK position. Remove fuel tank from vehicle. See «FUEL TANK»(ref-157824-S17785696912003091500000) under FUEL SYSTEM in REMOVAL & INSTALLATION article. Check fuel tank temperature sensor connector for poor, loose, corroded or damaged connector terminals. If connector terminals are okay, go to next step. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).
7. Perform fuel tank temperature sensor component test. See «FUEL TANK PRESSURE & TEMPERATURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If sensor is okay, go to next step. If sensor is faulty, replace fuel tank temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).
8. Disconnect ECM harness connector E61. Reconnect harness connectors between floor harness and main harness for fuel tank temperature sensor. Connect a fused jumper wire connected between fuel tank temperature sensor harness connector terminals No. 2 (Gray/Yellow wire) and No. 4 (Gray/Green wire). Measure resistance between ECM harness connector E61 terminals No. 10 (Gray/Green wire) and ECM 26-pin harness connector C51-3 terminal No. 21 (Gray/Yellow wire). (Scheme 28) If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open or short circuit in Gray/Yellow wire or Gray/Blue wire between ECM and fuel temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).
9. Perform «DTC P0116: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - RANGE/PERFORMANCE»(ref-158406-S31720561502003092400000).If ECT sensor circuit is faulty, repair or replace ECT sensor circuit and repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000). If ECT sensor circuit is okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S39005028412003123000000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Run engine at idle speed for 10 seconds or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P2026 resets, go to DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, select DATA LIST mode and observe EVAP FUEL VAPOR TEMP. parameter. If scan tool displays 271°F (133°C), go to next step. If scan tool does not display 271°F (133°C), problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article.
3. Turn ignition switch to LOCK position. Disconnect ECM 35-pin harness connector E61, located under instrument panel, behind glove box. see scheme 4 Check ECM and harness connector for poor, loose, corroded or damaged connector terminals. If connector terminals are okay, go to next step. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S19921401702003123000000).
4. Measure resistance between ground and ECM harness connector E61 terminal No. 10 (Gray/Green wire). If resistance is infinite, go to next step. If resistance is not infinite, repair short to ground in Gray/Blue wire between ECM and fuel temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S19921401702003123000000).
5. Reconnect ECM connectors. Disconnect harness connector between floor and main harness for fuel tank temperature sensor circuit. Turn ignition switch to ON position. Measure voltage between ECM harness connector E61 terminal No. 10 (Gray/Green wire) and ECM 26-pin harness connector C51-3 terminal No. 21 (Gray/Yellow wire). (Scheme 28) If voltage is 4-5 volts, go to next step. If voltage is not 4-5 volts, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S19921401702003123000000).
6. Turn ignition switch to LOCK position. Remove fuel tank from vehicle. See «FUEL TANK»(ref-157824-S17785696912003091500000) under FUEL SYSTEM in REMOVAL & INSTALLATION article. Check fuel tank temperature sensor connector for poor, loose, corroded or damaged connector terminals. If connector terminals are okay, go to next step. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S19921401702003123000000).
7. Perform fuel tank temperature sensor component test. See «FUEL TANK PRESSURE & TEMPERATURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If sensor is okay, go to next step. If sensor is faulty, replace fuel tank temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S19921401702003123000000).

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Run engine at idle speed for 10 seconds or more. Using scan tool, check for current or pending DTC. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC P2027 resets, go to DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. Turn ignition switch to ON position. Using scan tool, select DATA LIST mode and observe EVAP FUEL VAPOR TEMP. parameter. If scan tool displays -44°F (-42°C), go to next step. If scan tool does not display -44°F (-42°C), problem is intermittent. See «INTERMITTENTS»(ref-158314-S36733713052003092200000) in TROUBLE SHOOTING - NO CODES article.
3. Turn ignition switch to LOCK position. Disconnect ECM 35-pin harness connector E61 located under instrument panel, behind glove box. see scheme 4 Check ECM and harness connector for poor, loose, corroded or damaged connector terminals. If connector terminals are okay, go to next step. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000).
4. Check for continuity between ground and ECM harness connector E61 terminals No. 10 (Gray/Green wire) and ECM 26-pin harness connector C51-3 terminal No. 21 (Gray/Yellow wire). (Scheme 28) If resistance is infinite, go to next step. If resistance is not infinite, go to step 7.
5. Turn ignition switch to ON position. Measure voltage between ground and ECM harness connector E61 terminal No. 10 (Gray/Green wire). If voltage is zero volts, go to next step. If voltage is not zero volts, repair short circuit in Gray/Blue wire between ECM and fuel tank temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000).
6. Turn ignition switch to LOCK position. Reconnect ECM harness connectors. Disconnect harness connector between floor and main harness for fuel tank pressure and temperature sensor circuit. Turn ignition switch to ON position. Measure voltage between ground and ECM harness connector E61 terminals No. 10 (Gray/Green wire) and ECM 26-pin harness connector C51-3 terminal No. 21 (Gray/Yellow wire). (Scheme 28) If voltage is 4-5 volts, go to next step. If voltage is not 4-5 volts, check for short to another circuit in Gray/Blue wire between ECM and fuel tank temperature sensor. If short to another circuit is found, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000). If short to another circuit is not found, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000).
7. Turn ignition switch to LOCK position. Remove fuel tank from vehicle. See «FUEL TANK»(ref-157824-S17785696912003091500000) under FUEL SYSTEM in REMOVAL & INSTALLATION article. Check fuel tank temperature sensor connector for poor, loose, corroded or damaged connector terminals. If connector terminals are okay, go to next step. If connector terminals are faulty, repair as necessary and repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000).
8. Perform fuel tank temperature sensor component test. See «FUEL TANK PRESSURE & TEMPERATURE SENSOR»(ref-158706-S24790343132003101500000) under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If sensor is okay, go to next step. If sensor is faulty, replace fuel tank temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000).
9. Ensure ignition switch is in LOCK position. Disconnect ECM harness connector E61. Reconnect harness connector between floor and main harness for fuel tank temperature sensor. Connect a fused jumper wire between fuel tank temperature sensor harness connector terminals No. 2 (Gray/Yellow wire) and No. 4 (Gray/Green wire). Measure resistance between ECM harness connector E61 terminals No. 10 (Gray/Green wire) and ECM 26-pin harness connector C51-3 terminal No. 21 (Gray/Yellow wire). (Scheme 28) If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open or short circuit in Gray/Yellow wire or in Gray/Blue wire between ECM and fuel temperature sensor. After repair, repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000).
10. Perform «DTC P0116: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - RANGE/PERFORMANCE»(ref-158406-S31720561502003092400000).If ECT sensor circuit is faulty, repair or replace ECT sensor circuit and repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000). If ECT sensor circuit is okay, substitute ECM with a known good unit and repeat «DTC CONFIRMATION TEST»(ref-158406-S31866084212003123000000).

DTC Confirmation Test (DTC P2227)

1. Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See «CLEARING DIAGNOSTIC TROUBLE CODES»(ref-158406-S04908656072003092400000) under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to reach normal operating temperature.
2. Drive vehicle with engine at 3000 RPM in 3rd gear (M/T) or 2 range (A/T). Release accelerator pedal and allow vehicle to coast (with vehicle in gear) for 5 seconds or more with engine speed of 1600-3000 RPM. Stop vehicle and allow engine to idle.
3. Preform step 2 2 more times, for three times total. Using scan tool, check for current or pending DTC. See «RETRIEVING DIAGNOSTIC TROUBLE CODES»(ref-158406-S05859488132003092400000) under SELF-DIAGNOSTIC SYSTEM. If DTC P2227 resets, go to «DIAGNOSIS & REPAIR PROCEDURE»(ref-158406-S31678478272003123000000).

DTC Confirmation Test (DTCs P2228 & P2229)

Turn ignition switch to LOCK position. Connect SUZUKI scan tool or equivalent to DLC. see scheme 3 Turn ignition switch to ON position. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. Start engine and allow it to idle for one minute. Using scan tool, check for current or pending DTCs P2228 or P2229. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM. If DTC resets, go to DIAGNOSIS & REPAIR PROCEDURE.

Note. For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

Note. Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.

1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform «A-4: ENGINE SYSTEM CHECK»(ref-158406-S06834659132003112500000) under SYSTEM TESTS, then go to next step.
2. If during «DTC CONFIRMATION TEST (DTC P2228 & DTC P2229)»(ref-158406-S42400168712003123000000) , DTC P2227 was also retrieved, go to next step. If no other DTC was retrieved, substitute ECM with a known good unit and repeat appropriate DTC CONFIRMATION TEST procedure.
3. Perform MAP system test and MAP sensor component test for proper operation. See «DTC P0107 OR DTC P0108»(ref-158406-S34211836942003120200000) . If MAP sensor and system do not test as specified, repair as necessary and repeat appropriate DTC CONFIRMATION TEST procedure. If MAP sensor and system tests as specified, substitute ECM with a known good unit and repeat appropriate DTC CONFIRMATION TEST procedure.