FOREWORD [MZI 3.7 V6]
- When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication and diagnostic trouble code (DTC), then diagnose the malfunction according to the following flowchart
- If a DTC exists, diagnose the applicable DTC inspection. (See «DTC TABLE [MZI 3.7 V6]»(ref-448596-S32307133402012012000000) .)
- If no DTC exists and the MIL does not illuminate or flash, diagnose the applicable symptom troubleshooting. (See «QUICK DIAGNOSTIC CHART [MZI 3.7 V6]»(ref-448601-S22324817552012012000000) .)
Scheme 50
No. 1 MELTING OF MAIN OR OTHER FUSES [MZI 3.7 V6]
SYMPTOM CHART (MELTING OF MAIN OR OTHER FUSES) 1 MELTING OF MAIN OR OTHER FUSES (TROUBLESHOOTING HINTS)
Scheme 51
Scheme 51: No. 1 MELTING OF MAIN OR OTHER FUSES [MZI 3.7 V6]
| Damaged fuse | Related wiring harness |
|---|
| MAIN | MAIN fuse BTN fuse ROOM fuse FAN fuse IG KEY2 fuse ENG+B fuse |
| BTN | BTN fuse ROOM fuse |
| ROOM | ROOM fuse DLC-2 |
| FAN | FAN fuse Fan control module relay |
| IG KEY2 | IG KEY2 fuse Starter relay |
| ST SIG | ST SIG fuse PCM Starter relay |
| FUEL PUMP | FUEL PUMP fuse Fuel pump unit |
| ENG INJ | ENG INJ fuse PCM Fuel injector No. 1 Fuel injector No. 2 Fuel injector No. 3 Fuel injector No. 4 Fuel injector No. 5 Fuel injector No. 6 |
| ENGINE IG | ENGINE IG fuse PCM Fuel pump relay |
| ENG+B | ENG+B fuse PCM Canister vent solenoid valve Generator (IC regulator) |
| POM | PCM fuse Brake switch No. 2 PCM |
| ENGINE | ENGINE fuse HO2S heater (LH) HO2S heater (RH) A/F sensor heater (LH) A/F sensor heater (RH) OCV(LH) OCV(RH) |
| IG | IG fuse Ignition coil No. 1 Ignition coil No. 2 Ignition coil No. 3 Ignition coil No. 4 Ignition coil No. 5 Ignition coil No. 6 |
| ENGINE 2 | ENGINE 2 fuse MAF/IAT sensor Purge solenoid valve |
DAMAGED FUSE REFERENCE CHART
NO. 2 MIL ILLUMINATES [MZI 3.7 V6]
| 2 | MIL ILLUMINATES |
|---|
| DESCRIPTION | The MIL is illuminated incorrectly. |
| POSSIBLE CAUSE | The PCM illuminates for emission-related concern. (DTC is stored in PCM.) Instrument cluster malfunction NOTE: If the MIL blinks at steady rate, misfire condition could possibly exist. |
| NOTE |
|---|
| If the MIL blinks at steady rate, misfire condition could possibly exist. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 3 WILL NOT CRANK [MZI 3.7 V6]
DESCRIPTION AND POSSIBLE CAUSES 3 WILL NOT CRANK DESCRIPTION The starter does not work. POSSIBLE CAUSE Open circuit between ignition switch and starter Starter relay No. 2 malfunction Open or short circuit in wiring harness between keyless control module and starter relay No. 2 (with advanced keyless entry and push button start system) Low or dead battery Charging system malfunction Starter malfunction Seized/hydrolocked engine, drive plate Immobilizer system and/or circuit malfunction Immobilizer system operating properly. (Ignition key is not registered.) Advanced keyless entry and push button start system malfunction (with advanced keyless entry and push button start system) TR switch malfunction
Scheme 52
Scheme 52: NO. 3 WILL NOT CRANK [MZI 3.7 V6]
NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [MZI 3.7 V6]
| 4 | HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK |
|---|
| DESCRIPTION | The starter cranks engine at normal speed but engine requires excessive cranking time before starting. The battery is in normal condition. |
| POSSIBLE CAUSE | Vacuum leakage Poor fuel quality Air leakage or restriction in intake-air system Low or dead battery Charging system malfunction PCM DTC is stored. Engine overheating Purge solenoid valve malfunction MAF sensor contamination Incorrect MAF sensor ground voltage Improper operation of drive-by-wire control system Restriction in exhaust system Open circuit in PCM ground circuit Ignition coil related circuit malfunction Erratic signal to ignition coil Spark plug malfunction Erratic signal from CKP sensor Erratic signal from CMP sensor Inadequate fuel pressure Open or short circuit in fuel pump and related wiring harness Fuel pump mechanical malfunction Fuel line clogged Pressure regulator malfunction (built-in fuel pump unit) Fuel leakage from fuel system PCV valve malfunction Starting system malfunction Electrical connector loose or terminal poor contact WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 5 ENGINE STALLS-AFTER START/AT IDLE [MZI 3.7 V6]
| 5 | ENGINE STALLS-AFTER START/AT IDLE |
|---|
| DESCRIPTION | Engine stops unexpectedly. |
| POSSIBLE CAUSE | Vacuum leakage Air leakage from intake-air system parts Air cleaner restriction Poor fuel quality Electrical connector disconnection Throttle valve restriction or clogged PCM DTC is stored. No battery power supply to PCM or poor ground Erratic signal to PCM APP sensor or related circuit malfunction TP sensor or related circuit malfunction Improper operation of drive-by-wire control system Restriction in exhaust system No signal from CKP sensor due to sensor, related wire or wrong installation Ignition coil or related circuit malfunction Spark plug malfunction Fuel leakage from fuel injector Fuel injector clogging Inadequate fuel pressure Open or short circuit in fuel pump and related wiring harness Fuel pump mechanical malfunction Fuel line clogged Pressure regulator malfunction (built-in fuel pump unit) Fuel leakage from fuel system PCV valve malfunction A/C system operation is improper. Purge solenoid valve malfunction Air leakage from intake air system when engine runs high speed Improper operation variable valve timing control system Low engine compression Improper valve timing WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 6 CRANKS NORMALLY BUT WILL NOT START [MZI 3.7 V6]
| 6 | CRANKS NORMALLY BUT WILL NOT START |
|---|
| DESCRIPTION | The starter cranks engine at normal speed but the engine will not run. Refer to the NO. 5 ENGINE STALLS-AFTER START/AT IDLE if this symptom appears after the engine stall. Fuel is in the tank. Battery is in normal condition. |
| POSSIBLE CAUSE | Vacuum leakage Poor fuel quality Air leakage from intake-air system Restriction in intake-air system Disconnected electrical connector External engine shut-off accessory Restriction in exhaust system Throttle valve restriction No battery power supply to PCM Open PCM ground or vehicle body ground PCM DTC is stored. Erratic signal to PCM APP sensor or related circuit malfunction TP sensor or related circuit malfunction Improper operation of drive-by-wire control system No signal from CKP sensor due to sensor, related wire or incorrect installation No signal from CMP sensor due to sensor, related wire or incorrect installation Ignition coil or related circuit malfunction Fuel leakage from injector Fuel injector is clogged. Inadequate fuel pressure Open or short circuit in fuel pump body and related wiring harness Fuel pump mechanical malfunction Fuel line clogged Pressure regulator malfunction (built-in fuel pump unit) Fuel leakage from fuel system PCV valve malfunction Purge solenoid valve malfunction Air leakage in intake air system when engine runs high speed Low engine compression Improper variable valve timing control system operation Improper valve timing WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector with out cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector with out cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 7 SLOW RETURN TO IDLE [MZI 3.7 V6]
| 7 | SLOW RETURN TO IDLE |
|---|
| DESCRIPTION | Engine takes more time than normal to return to idle speed. |
| POSSIBLE CAUSE | PCM DTC is stored. Air leakage from intake-air system Throttle body malfunction Erratic signal from PSP switch Thermostat is stuck open. CHT sensor malfunction |
DESCRIPTION AND POSSIBLE CAUSES
NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [MZI 3.7 V6]
| 8 | ENGINE RUNS ROUGH/ROLLING IDLE |
|---|
| DESCRIPTION | Engine speed fluctuates between specified idle speed and lower speed and engine shakes excessively. Idle speed is too slow and engine shakes excessively. |
| POSSIBLE CAUSE | Idle learning of drive-by-wire control system is not completed. Poor fuel quality Air cleaner restriction Vacuum leakage Disconnected electrical connectors Air leakage from intake-air system parts No battery power supply to PCM Open or short circuit in PCM ground circuit PCM DTC is stored. Engine overheating MAF sensor or related circuit malfunction A/C system operation is improper. Power steering pressure switch or related circuit malfunction Erratic signal from CKP sensor Ignition system malfunction Ignition coil malfunction Ignition coil related circuit malfunction Spark plug malfunction Fuel leakage from fuel injector Fuel injector clogging Improper operation of drive-by-wire control system Inadequate fuel pressure Fuel pump mechanical malfunction Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit) Fuel leakage from fuel system Purge solenoid valve malfunction PCV valve malfunction Erratic or no signal from CMP sensor Improper variable valve timing control system operation Low engine compression Improper valve timing WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 9 FAST IDLE/RUNS ON [MZI 3.7 V6]
| 9 | FAST IDLE/RUNS ON |
|---|
| DESCRIPTION | The engine speed continues at fast idle after warm-up. The engine runs after the ignition is off. |
| POSSIBLE CAUSE | CHT sensor malfunction Improper load signal input Refrigerant pressure sensor malfunction Communication error between instrument cluster and PCM Erratic signal from climate control unit (A/C switch, fan switch malfunction) Evaporator temperature sensor malfunction Open or short circuit in wiring harness between climate control unit and instrument cluster Erratic signal from PSP switch TR switch malfunction Communication error between TCM and PCM Improper operation of drive-by-wire control system Air leakage from intake-air system Cruise control system operation improperly APP sensor malfunction |
DESCRIPTION AND POSSIBLE CAUSES
NO. 10 LOW IDLE/STALLS DURING DECELERATION [MZI 3.7 V6]
| 10 | LOW IDLE/STALLS DURING DECELERATION |
|---|
| DESCRIPTION | Engine stops unexpectedly at the beginning of deceleration or recovery from deceleration. |
| POSSIBLE CAUSE | Improper A/C magnetic clutch operation Vacuum leakage Air leakage from intake-air system Improper routing vacuum line PCM DTC is stored. Improper operation of drive-by-wire control system EVAP control system malfunction Erratic signal to PCM APP sensor or related circuit malfunction TP sensor or related circuit malfunction MAF sensor or related circuit malfunction Brake switch or related circuit malfunction TR switch or related circuit malfunction VSS or related circuit malfunction |
DESCRIPTION AND POSSIBLE CAUSES
NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZI 3.7 V6]
| 11 | ENGINE STALLS/QUITS-ACCELERATION/CRUISE ENGINE RUNS ROUGH-ACCELERATION/CRUISE MISSES-ACCELERATION/CRUISE BUCK/JERK-ACCELERATION/CRUISE/DECELERATION HESITATION/STUMBLE-ACCELERATION SURGES-ACCELERATION/CRUISE |
|---|
| DESCRIPTION | Engine stops unexpectedly at the beginning of acceleration or during acceleration. Engine stops unexpectedly while cruising. Engine speed fluctuates during acceleration or cruising. Engine misses during acceleration or cruising. Vehicle bucks/jerks during acceleration, cruising, or deceleration. Momentary pause at beginning of acceleration or during acceleration. Momentary minor irregularity in engine output. |
| POSSIBLE CAUSE | Vacuum leakage Air cleaner restriction Air leakage from intake-air system parts Intake air system restriction Poor fuel quality Disconnected electrical system connector Loose attaching bolts or worn engine mounts PCM DTC is stored. Engine overheating Throttle body restriction or clogged Erratic signal to PCM APP sensor or related circuit malfunction TP sensor or related circuit malfunction CKP sensor or related circuit malfunction MAF sensor or related circuit malfunction TP sensor or related circuit malfunction Battery or related circuit malfunction VSS or related circuit malfunction Erratic signal from CKP sensor Fuel leakage from fuel injector Fuel injector clogging Improper operation of drive-by-wire control system Restriction in exhaust system Inadequate fuel pressure Intermittent open or short circuit in fuel pump circuit Fuel pump mechanical malfunction Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit) Fuel leakage from fuel system Improper A/C system operation Improper operation of cruise control system Improper air/fuel mixture ratio control operation A/F sensor or related circuit malfunction PCV valve malfunction Check valve (two-way) malfunction integrated with fuel tank Purge solenoid valve malfunction Fuel flow into evaporative purge hose Erratic signal or no signal from CMP sensor Low engine compression Improper valve timing due to jumping out timing chain ATX malfunction WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZI 3.7 V6]
| 12 | LACK/LOSS OF POWER-ACCELERATION/CRUISE |
|---|
| DESCRIPTION | Performance is poor under load (such as power down when climbing hills). |
| POSSIBLE CAUSE | Vacuum leakage Restriction in intake-air system Air leakage from intake-air system parts Poor fuel quality PCM DTC is stored. Engine overheating Intake air temperature too hot Erratic signal to PCM APP sensor or related circuit malfunction MAF sensor or related circuit malfunction TP sensor or related circuit malfunction IAT sensor or related circuit malfunction CKP sensor or related circuit malfunction VSS or related circuit malfunction Erratic signal from CKP sensor Fuel leakage from fuel injector Fuel injector clogging Throttle body restriction or clogged Improper operation of drive-by-wire control system Restriction in exhaust system Inadequate fuel pressure Open or short in fuel pump related circuit Fuel pump mechanical malfunction Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit) Improper A/C system operation Improper A/C cut-off operation PCV valve malfunction Purge control solenoid malfunction Erratic signal or no signal from CMP sensor Improper variable valve timing control operation Low engine compression Improper valve timing due to jumping out of timing chain ATX malfunction Brake dragging WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI 3.7 V6]
| 13 | KNOCKING/PINGING-ACCELERATION/CRUISE |
|---|
| DESCRIPTION | Sound is heard when air/fuel mixture is ignited by something other than spark plug (such as hot spot in combustion chamber). |
| POSSIBLE CAUSE | Engine overheating due to cooling system malfunction IAT sensor malfunction MAF sensor malfunction PCM DTC is stored. Inadequate engine compression Erratic signal from CMP sensor Erratic signal from CKP sensor Inadequate Fuel pressure Intermittent open or short circuit in fuel pump circuit Fuel pump mechanical malfunction Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit) KS malfunction Improper ignition timing Poor fuel quality (i.e. Fuel RON is not specified, excessive cleaning agents added in fuel.) WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 14 POOR FUEL ECONOMY [MZI 3.7 V6]
| 14 | POOR FUEL ECONOMY |
|---|
| DESCRIPTION | Fuel economy is unsatisfactory. |
| POSSIBLE CAUSE | Contaminated air cleaner element Improper ATF level Poor fuel quality Improper coolant level Brake dragging Improper tire pressure PCM DTC is stored. Engine cooling system malfunction Weak spark Ignition system malfunction (ignition coil, ignition coil related circuit or spark plug malfunction) Inadequate fuel pressure Intermittent open or short circuit in fuel pump circuit Fuel pump mechanical malfunction Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit) Improper variable valve timing control system operation Exhaust system clogging Contaminated MAF sensor Improper engine compression PCV valve malfunction Improper valve timing due to jumping out of timing chain WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 15 EMISSION COMPLIANCE [MZI 3.7 V6]
| 15 | EMISSION COMPLIANCE |
|---|
| DESCRIPTION | Fails emissions test. |
| POSSIBLE CAUSE | Vacuum lines leakage or blockage Disconnected electrical system connector Maintenance schedule is not followed. Leakage from intake manifold Air cleaner element clogging or restriction Throttle body restrict or clogged PCM DTC is stored. Cooling system malfunction Fuel-filler cap malfunction Ignition system malfunction Ignition coil malfunction Ignition coil related circuit malfunction Spark plug malfunction Inadequate fuel pressure Fuel pump mechanical malfunction Fuel line restriction or dogging Pressure regulator malfunction (built-in fuel pump unit) Improper air/fuel mixture ratio control operation Bend or open circuit A/F sensor wiring harness Exhaust system clogging PCV valve malfunction or incorrect valve installation Improper engine compression Fuel tank ventilation system malfunction Charcoal canister damage Catalyst converter malfunction Engine internal parts malfunction Excessive carbon is built up in combustion chamber. Improper valve timing WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION ° described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION ° described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 16 HIGH OIL CONSUMPTION/LEAKAGE [MZI 3.7 V6]
| 16 | HIGH OIL CONSUMPTION/LEAKAGE |
|---|
| DESCRIPTION | Oil consumption is excessive. |
| POSSIBLE CAUSE | PCV valve malfunction Improper dipstick Improper engine oil viscosity Engine internal parts malfunction |
DESCRIPTION AND POSSIBLE CAUSES
NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI 3.7 V6]
| 17 | COOLING SYSTEM CONCERNS-OVERHEATING |
|---|
| DESCRIPTION | Engine runs at higher than normal temperature/overheats. |
| POSSIBLE CAUSE | Improper coolant level Coolant leakage Improper water/anti-freeze mixture Poor radiator condition Radiator hoses damage Improper or damaged radiator cap Coolant overflow system malfunction Fans reverse rotation Blown cooling fan control related fuses PCM DTC is stored. A/C system operation is improper. Cooling fan is inoperative. Improper tension of drive belt Drive belt damage Coolant leakage from climate control unit Improper water temperature gauge operation CHT sensor malfunction Instrument cluster malfunction Thermostat malfunction Cylinder block or cylinder head malfunction (cracked, coolant restriction) |
DESCRIPTION AND POSSIBLE CAUSES
NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI 3.7 V6]
| 18 | COOLING SYSTEM CONCERNS-RUNS COLD |
|---|
| DESCRIPTION | Engine takes excessive time to reach normal operating temperature. |
| POSSIBLE CAUSE | A/C and heater system malfunction Thermostat malfunction Cooling fan system malfunction Improper water temperature gauge operation CHT sensor malfunction Instrument cluster malfunction |
DESCRIPTION AND POSSIBLE CAUSES
NO. 19 EXHAUST SMOKE [MZI 3.7 V6]
| 19 | EXHAUST SMOKE |
|---|
| DESCRIPTION | Blue, black, or white smoke from exhaust system. |
| POSSIBLE CAUSE | Blue smoke (Burning oil): PCV valve malfunction Engine internal oil leakage White smoke (Water in combustion): Cooling system malfunction (coolant loss) Engine internal coolant leakage Black smoke (Rich fuel mixture): Air cleaner restriction Intake-air system is collapsed or restricted. PCM DTC is stored. Erratic signal to PCM APP sensor or related circuit malfunction CHT sensor or related circuit malfunction IAT sensor or related circuit malfunction MAF sensor or related circuit malfunction MAP sensor or related circuit malfunction A/F sensor or related circuit malfunction HO2S or related circuit malfunction TP sensor or related circuit malfunction VSS or related circuit malfunction Excessive fuel pressure Fuel pump mechanical malfunction Fuel line restriction or clogging Pressure regulator malfunction (built-in fuel pump unit) Ignition system malfunction Ignition coil malfunction Ignition coil related circuit malfunction Spark plug malfunction Erratic CMP sensor signal Improper engine compression Improper fuel injection timing and amount WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI 3.7 V6]
| 20 | FUEL ODOR (IN ENGINE COMPARTMENT) |
|---|
| DESCRIPTION | Gasoline fuel smell or visible leakage. |
| POSSIBLE CAUSE | Fuel leakage from fuel system Excessive fuel line pressure Pressure regulator malfunction (built-in fuel pump unit) Fuel tank vent system blockage Purge solenoid valve malfunction PCM DTC is stored. Charcoal canister malfunction WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 23 A/C DOES NOT WORK SUFFICIENTLY [MZI 3.7 V6]
| 23 | A/C DOES NOT WORK SUFFICIENTLY |
|---|
| DESCRIPTION | A/C compressor magnetic clutch does not engage when the A/C switch is turned on. |
| POSSIBLE CAUSE | PCM, climate control unit or instrument cluster DTC is stored. Refrigerant pressure sensor malfunction Improper refrigerant charging amount Seized magnetic clutch Evaporator temperature sensor malfunction Open or short circuit in wiring harness between evaporator temperature sensor and climate control unit Instrument cluster malfunction (Does not receive A/C request signal from climate control unit or transmit it to PCM.) Information display malfunction Climate control unit malfunction (A/C switch malfunction or climate control unit does not determine A/C request or transmit the A/C request signal.) Open or short circuit in wiring harness between climate control unit terminal 1L and instrument cluster terminal 1A (Manual air conditioner) Magnetic clutch malfunction Open circuit in wiring harness between magnetic clutch terminal A and body ground A/C relay malfunction Open or short circuit in wiring harness between A/C relay and PCM terminal 1W Open in wiring harness between ignition switch (IG2)*1/IG2 relay*2 and A/C relay Open circuit in wiring harness between battery positive terminal and A/C relay Open circuit in wiring harness between A/C relay and magnetic clutch |
DESCRIPTION AND POSSIBLE CAUSES
NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI 3.7 V6]
| 24 | A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY |
|---|
| DESCRIPTION | A/C compressor magnetic clutch does not disengage. |
| POSSIBLE CAUSE | A/C compressor magnetic clutch engagement is stuck. A/C relay is stuck closed. Short to ground in wiring harness between A/C relay and PCM Short to power supply in A/C relay to magnetic clutch Climate control module malfunction (A/C switch signal stuck on.) Communication error between PCM and climate control module |
DESCRIPTION AND POSSIBLE CAUSES
NO. 25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [MZI 3.7 V6]
| 25 | A/C DOES NOT CUT OFF UNDER WOT CONDITIONS |
|---|
| DESCRIPTION | A/C compressor magnetic clutch does not disengage under WOT. |
| POSSIBLE CAUSE | APP sensor malfunction Loosely installed accelerator pedal |
DESCRIPTION AND POSSIBLE CAUSES
NO. 26 EXHAUST SULPHUR SMELL [MZI 3.7 V6]
| 26 | EXHAUST SULPHUR SMELL |
|---|
| DESCRIPTION | Rotten egg smell (sulphur) from exhaust. |
| POSSIBLE CAUSE | Electrical connectors are disconnected or connected poorly. Charcoal canister malfunction Vacuum lines are disconnected or connected improperly. Improper fuel pressure Poor fuel quality WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 28 FUEL FILLING SHUT OFF CONCERNS [MZI 3.7 V6]
| 28 | FUEL FILLING SHUT OFF CONCERNS |
|---|
| DESCRIPTION | Fuel does not shut off properly. |
| POSSIBLE CAUSE | Clogged EVAP pipes non-return valve malfunction Fuel shut-off valve malfunction Fuel nozzle malfunction Fuel nozzle is not inserted correctly. WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always dean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always dean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
NO. 29 SPARK PLUG CONDITION [MZI 3.7 V6]
| 29 | SPARK PLUG CONDITION |
|---|
| DESCRIPTION | Incorrect spark plug condition. |
| POSSIBLE CAUSE | NOTE: Inspecting spark plugs condition can determine whether problem is related to a specific cylinder or possibly all cylinders. Wet/carbon stuck on specific plug: Spark-Weak, not visible Air/fuel mixture-Excessive fuel injection volume Compression-No compression, low compression Malfunction spark plug Grayish white with specific plug: Air/fuel mixture-Insufficient fuel injection volume Malfunction spark plug Wet/carbon is stuck on all plugs: Spark rich, excessive fuel line pressure Air/fuel mixture-Too rich Erratic signal to PCM CHT sensor or related circuit malfunction MAF sensor or related circuit malfunction A/F sensor or related circuit malfunction HO2S or related circuit malfunction Compression-Low compression Clogging in intake/exhaust system Poor fuel quality Grayish white with all plugs: Air/fuel mixture-Too lean, insufficient fuel line pressure Erratic signal to PCM CHT sensor or related circuit malfunction MAF sensor or related circuit malfunction A/F sensor or related circuit malfunction HO2S or related circuit malfunction WARNING: The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) CAUTION: Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
| NOTE |
|---|
| Inspecting spark plugs condition can determine whether problem is related to a specific cylinder or possibly all cylinders. |
| WARNING |
|---|
| The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual. (See BEFORE SERVICE PRECAUTION [MZI 3.7 V6] .) (See AFTER SERVICE PRECAUTION [MZI 3.7 V6] .) |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material. |
DESCRIPTION AND POSSIBLE CAUSES
Finding irregular signals
- While referring to 01-02B-6 ON-BOARD DIAGNOSTIC TEST [MZI 3.7 V6], use the PID/DATA monitor and record function to inspect the input signal system relating to the problem.
- Start the engine and idle the vehicle. You can assume that any signals that are out of specification by a wide margin are irregular.
- When recreating the problem, any sudden change in monitor input signals that is not intentionally created by the driver can be determined as irregular.
Locating the source of unusual signals
| CAUTION | Compare the M-MDS monitor voltage with the measurement voltage using the digital measurement system function. If you use another tester, misreading may occur. When measuring voltage, attach the tester GND to the GND of the PCM that is being tested, or to the engine itself. If this is not performed, the measured voltage and actual voltage may differ. After connecting the pin to a waterproof coupler, confirming continuity and measuring the voltage, inspect the waterproof connector for cracks. If there are any, use sealant to fix them. Failure to do this may result in deterioration of the wiring harness or terminal from water damage, leading to problems with the vehicle. |
Scheme 53
Scheme 53: Variable resistance type (TP sensor)
If active command mode function of the M-MDS is used
- Warm up the engine and idle it.
- Connect the M-MDS to the DLC-2.
- Select the PCM PIDs RPM and FUELSYS.
- Monitor the both PIDs while performing the following steps. Depress the accelerator pedal and increase the RPM PID to 4,000 RPM. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the FUELSYS PID is OL, and CL when the RPM PID drops below 1,200 RPM. If not as specified, inspect the following. CHT sensor and related harness (See «CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI 3.7 V6]»(ref-448597-S23244452462012012000000) .)
If active command mode function of the M-MDS is not used
- Warm up the engine and idle it.
- Measure the fuel injector control signal wave profile using the oscilloscope while performing the following steps. Depress the accelerator pedal and increase the engine speed to 4,000 RPM. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the wave profile constant B+, and appears wave, when the engine speed drops below 2,200 RPM. If not as specified, inspect the following. CHT sensor and related harness (See «CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI 3.7 V6]»(ref-448597-S23244452462012012000000) .)
- Start the engine.
- Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.
- Put the finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold. If there is a vacuum, inspect the following: Wiring harness and connectors (Purge solenoid valve terminal B-PCM terminal 2H) Purge solenoid vale (stuck open) (See «PURGE SOLENOID VALVE INSPECTION [MZI 3.7 V6]»(ref-448604-S11147059192012012000000) .)
- Connect the M-MDS to the DLC-2 and verify that the DTC P0443:00 is shown. If the P0443:00 are displayed, perform the DTC inspection. (See «DTC P0443:00 [MZI 3.7 V6]»(ref-448596-S02917848772012012000000) .)
- Select the PCM PID EVAPCR
- Increase the duty value of the purge solenoid valve to 50 % and inspect if the operation sound of the valve is heard. If the operation sound is heard, inspect for the loose or damaged vacuum hose. (Intake manifold-Purge solenoid valve-Charcoal canister) If the operation sound is not heard, perform the purge solenoid valve inspection. (See «PURGE SOLENOID VALVE INSPECTION [MZI 3.7 V6]»(ref-448604-S11147059192012012000000) .)
- Warm up the engine to normal operating temperature.
- Monitor the EVAPCP PID using the M-MDS, and drive the vehicle approx. 2,000 RPM for 30 s or more. If the EVAPCP PID is 0 %, inspect the PCM PIDs MAF, APP1, APP2, TP REL and LOAD.
- Start the engine.
- Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.
- Put the finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold. If there is a vacuum, inspect the following: Wiring harness and connectors (Purge solenoid valve-PCM terminal 2H) Purge solenoid vale (stuck open) (See «PURGE SOLENOID VALVE INSPECTION [MZI 3.7 V6]»(ref-448604-S11147059192012012000000) .)
- Connect the M-MDS to the DLC-2 and verify that the DTC P0443:00 is shown. If the P0443:00 are displayed, perform the DTC inspection. (See «DTC P0443:00 [MZI 3.7 V6]»(ref-448596-S02917848772012012000000) .)
- Access the PCM PIDs EVAPCP and ECT.
- Verify that the ECT PID is more than 78 °C {172 °F} . If the ECT PID reading indicates less than 78 °C {172 °F}, perform the CHT sensor inspection. (See «CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI 3.7 V6]»(ref-448597-S23244452462012012000000) .)
- Set the vehicle on the dynamometer or chassis roller. WARNING: When the dynamometer or chassis roller is operating, there is a possibility that the operator may come into contact with or be caught up in the rotating parts, leading to serious injuries or death. When performing work while the dynamometer or chassis roller is operating, be careful not to come into contact with or caught up in any of the rotating parts.
- Drive the vehicle approx. 2,000 RPM for 30 s or more. If there is no vacuum, inspect the following: Wiring harness and connector (Main relay-Purge solenoid valve-PCM terminal 2H) Purge solenoid valve (See «PURGE SOLENOID VALVE INSPECTION [MZI 3.7 V6]»(ref-448604-S11147059192012012000000) .) MAF, APP1, APP2, TP REL and LOAD PIDs If there is vacuum, inspect the following: Vacuum hose (Purge solenoid valve-Charcoal canister)
Cooling fans do not operate
- Inspect for followings: Open circuit between fan control module relay and battery positive terminal Open circuit between fan control module relay and PCM terminal 1BI Open circuit between fan control module relay and fan control module terminal 1C Open circuit between fan control module terminal 1A and ground Poor connection of the fan control module connector Fan control module relay malfunction (See «RELAY INSPECTION»(ref-448587-S07835372662012012000000) .) Open or short circuit between fan control module terminal 1B and PCM terminal 1AY Open or short circuit between ignition switch (IG1) *1 /IG1 relay *2 and fan control module relay If there is malfunction, repair or replace malfunctioning part. If there is no malfunction, replace the fan control module. (See «COOLING FAN MOTOR REMOVAL/INSTALLATION [MZI 3.7 V6]»(ref-448600-S28285806762012012000000) .)
*1 : Vehicles without advanced keyless entry and push button start system
*2 : Vehicles with advanced keyless entry and push button start system
Cooling fan motor No. 1 does not operate
- Inspect for followings: Open or short to ground circuit between fan control module and cooling fan motor No. 1 Poor connection of the fan control module connector or cooling fan motor No. 1 connector Cooling fan motor No. 1 malfunction (See «COOLING FAN MOTOR INSPECTION [MZI 3.7 V6]»(ref-448600-S19719349382012012000000) .) If there is malfunction, repair or replace malfunctioning part. If there is no malfunction, replace the fan control module. (See «COOLING FAN MOTOR REMOVAL/INSTALLATION [MZI 3.7 V6]»(ref-448600-S28285806762012012000000) .)
Cooling fan motor No. 2 does not operate
- Inspect for followings: Open or short to ground circuit between fan control module and the cooling fan motor No. 2 Poor connection of the fan control module connector or the cooling fan motor No. 2 connector Cooling fan motor No. 2 malfunction (See «COOLING FAN MOTOR INSPECTION [MZI 3.7 V6]»(ref-448600-S19719349382012012000000) .) If there is malfunction, repair or replace malfunctioning part. If there is no malfunction, replace the fan control module. (See «COOLING FAN MOTOR REMOVAL/INSTALLATION [MZI 3.7 V6]»(ref-448600-S28285806762012012000000) .)
EVAP system malfunction judgment
- M-MDS detect the small/large leak or blockage based on fuel tank pressure at the end of EVAP Test.
Scheme 54
Scheme 55
Scheme 55: Evaporative system test procedure
- Verify that all PIDs within the following specifications. NOTE: To successfully perform this procedure, after PIDs must be within the specifications before proceeding to the next step.
- Select the following items from the initialization screen of the M-MDS. Select the "Powertrain". Select the "Fuel". Select the "EVAP Test". Verify that ECT and IAT are within the specifications at the confirmation screen. To successfully perform this procedure, ECT and IAT must be within the spec before proceeding to the next step. Fuel Level must be maintained within 15 %-85 %. PCM will cancel the EVAP Test If the Fuel Level is lower than 15 % or higher than 85 %.
- Verify the test results described on the M-MDS and follow the instructions.
Scheme 56
Scheme 56: EVAP system leak inspection using leak tester
Scheme 57
- Perform the following SST (EVAP System Tester 134-01049) self-test: NOTE: If the tester does not work correctly during the self-test, refer to the tester operators manual . Verify that the control valve on the panel is in the HOLD position then open the nitrogen bottle valve. Connect the vehicle interface hose (part of the SST) to the SELF-TEST port located on the control panel. Hand tighten the fitting. (Do not overtighten.) Turn the control valve to the TEST position. The gauge should read 331-381 mm {13.1-15.0 in} of water. If the gauge is not reading in this range, adjust the pressure by turning the black knob on the low pressure regulator at the nitrogen bottle. Turn the control valve to the HOLD position. Verify that the gauge holds pressure and that the flow meter reads no flow. If there is no drop in pressure and no flow, the tester passes the self-test. If the gauge leaks down, refer to the tester operators manual.
- Connect the SST to the vehicle. Verify that the control valve on the panel is in the HOLD position then open the nitrogen bottle valve. Remove the fuel-filler cap from the vehicle. If the fuel-filler cap is not a MAZDA part or equivalent, replace it. NOTE: INSPECT FUEL FILLER CAP AND FILLER NECK Visually inspect for damage, insufficient sealing, rust, cracks or warps for filler cap and filler neck. Repair or replace if necessary. Connect the receiver assembly ( SST: 134-01059) to the vehicle cap test hose assembly (part of the SST ) and the fuel-filler cap from the vehicle. Connect the cap adaptor ( SST: 134-01058) to the vehicle cap test hose assembly (part of the SST ) and to the fuel-filler neck. Connect the vehicle interface hose (part of the SST ) to the center fitting of the vehicle cap test hose assembly (part of the SST ).
- Connect the M-MDS to the DLC-2.
- Switch the ignition to ON (Engine off).
- Request the PCM on-board device control (Mode 08) using the M-MDS to close the canister vent value. NOTE: The canister vent value is closed for 10 min unless the following any actions are done: Engine is started. Ignition is switched to off.
- Make sure the control valve on the 134-01049 is in the HOLD position and that the valve on the cylinder of nitrogen gas is open.
- Turn the control valve to the open position and let the system fill. You should note a drop in the gauge pressure along with the flow meter being pegged at maximum flow for several minutes depending on how full or empty the fuel tank is, and how long it takes to completely fill and pressurize the EVAP system hoses.
- If the gauge and the flow meter do not settle to a measurable level after 2-3 min {0.08-0.11 in}, Then refer to the «EMISSION SYSTEM - [MZI 3.7 V6]»(ref-448604) to verify that the canister vent valve is properly closed. If canister vent valve is properly closed. The EVAP system has large leakage. Check for leakage and repair as necessary.
- Verify the pressure gauge and flow meter reading to determine if there is an EVAP leak: NO EVAPORATIVE LEAK: The flow meter registers "zero flow" and the pressure gauge returns to the pre-set pressure of 356 mm {14.0 in} of water (H2O). EVAPORATIVE LEAK: The pressure does not return to the preset level of 356 mm (14.0 in) of water (H2O) when measuring the flow. See setting leak standard for testing (.020 to.040 inch H2O) of the Evaporative Emissions Tester operators manual (134-01067). NOTE: Turn the control valve to the HOLD position then disconnect the SST.
![Scheme 51: No. 1 MELTING OF MAIN OR OTHER FUSES [MZI 3.7 V6]](https://i.diagnostdata.com/repair/c0/c0e3d91fde673a6bda0806042e3af91b1d37b3fc76506504357ac3dd5870a714.webp)
![Scheme 52: NO. 3 WILL NOT CRANK [MZI 3.7 V6]](https://i.diagnostdata.com/repair/35/35aa7613d1424ca00b772a985578bbbcc1b969ef6ac3b63a49d22ea20b575992.webp)
