NO. 1 MELTING OF MAIN OR OTHER FUSES [L3]
FUSE REFERENCE 1 MELTING OF MAIN OR OTHER FUSES [TROUBLESHOOTING HINTS] Inspect condition of fuse
Scheme 174
Scheme 174: NO. 1 MELTING OF MAIN OR OTHER FUSES [L3]
| Damaged fuse | Related wiring harness |
|---|
| MAIN (100A) | MAIN fuse IG KEY2 fuse AD FAN fuse FAN fuse BTN fuse Generator |
| ENG +B (10A) | ENG +B fuse PCM |
| IG KEY1 (40A) | IG KEY1 fuse Ignition switch ENGINE IG fuse METER IG fuse |
| IG KEY2 (30A) | IG KEY2 fuse Ignition switch Starter relay |
| ETC (7.5A) | ETC fuse ETC relay PCM |
| AD FAN (30A) | AD FAN fuse Cooling fan relay No.1 Cooling fan motor No.1 Cooling fan motor No.2 |
| FAN (30A) | FAN fuse Cooling fan relay No.2 Cooling fan motor No.1 Cooling fan relay No.3 Cooling fan motor No.2 |
| ENGINE IG (15A) | ENGINE IG fuse PCM Ignition coil Capacitor |
| METER IG (15A) | METER IG fuse Cooling fan relay No.1 PCM Cooling fan relay No.2 PCM Cooling fan relay No.3 PCM Cooling fan relay No.4 PCM Heated oxygen sensor heater (front) (1) Heated oxygen sensor heater (rear) (1) |
| ENG BAR (10A) | ENG BAR fuse EGR valve Purge solenoid valve MAF/IAT sensor Variable air duct control solenoid valve OCV Variable intake air system control solenoid valve Variable tumble solenoid valve EVAP system leak detection pump |
| ENG BAR2 (15A) (2) | ENG BAR2 fuse Heated oxygen sensor heater (front) Heated oxygen sensor heater (rear) |
| INJ (15A) | INJ fuse PCM Fuel pump relay PCM Check connector Fuel injectors ETC relay PCM |
| FUEL PUMP (15A) | FUEL PUMP fuse Main relay PCM Fuel pump relay Fuel pump |
| BTN (40A) | BTN fuse ROOM fuse |
| ROOM (15A) | ROOM fuse DLC |
| (1) California emission regulation applicable ATX model (2) Except for California emission regulation applicable ATX model |
| (1) | California emission regulation applicable ATX model |
| (2) | Except for California emission regulation applicable ATX model |
NO. 2 MIL ILLUMINATES [L3]
| 2 | MIL ILLUMINATES |
|---|
| DESCRIPTION | MIL is illuminated. |
| POSSIBLE CAUSE | PCM illuminates for emission-related concern (DTC is stored in PCM) Instrument cluster malfunction NOTE: If MIL blinks at steady rate, misfire condition could possibly exist. |
| NOTE |
|---|
| If MIL blinks at steady rate, misfire condition could possibly exist. |
POSSIBLE CAUSE DESCRIPTION
NO. 3 WILL NOT CRANK [L3]
| 3 | WILL NOT CRANK |
|---|
| DESCRIPTION | Starter does not work. |
| POSSIBLE CAUSE | Open starter circuit between ignition switch and starter TR switch malfunction (ATX) TR switch misadjustment (ATX) Low or dead battery. Charging system malfunction. Starter interlock switch malfunction (MTX). Starter malfunction Seized/hydrolocked engine, flywheel or drive plate Immobilizer system (PATS) and/or circuit malfunction. |
POSSIBLE CAUSE DESCRIPTION
NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [L3]
| 4 | HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK |
|---|
| DESCRIPTION | Starter cranks engine at normal speed but engine requires excessive cranking time before starting. Battery is in normal condition. |
| POSSIBLE CAUSE | Vacuum leakage Poor fuel quality Starting system malfunction Erratic signal to ignition coil Spark plug malfunction Air leakage from intake-air system Erratic signal from CKP sensor Erratic signal from CMP sensor Improper air/fuel mixture ratio control Air cleaner restriction Improper operation of electronic throttle control system PCV valve malfunction Inadequate fuel pressure Purge solenoid valve malfunction MAF sensor contamination Restriction in exhaust system EGR valve malfunction Pressure regulator 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 5 ENGINE STALLS-AFTER START/AT IDLE [L3]
| 5 | ENGINE STALLS-AFTER START/AT IDLE |
|---|
| DESCRIPTION | Engine stops unexpectedly. |
| POSSIBLE CAUSE | A/C system operation is improper Air leakage from intake-air system parts Purge solenoid valve malfunction Improper operation of electronic throttle control system EGR valve malfunction No signal from CKP sensor due to sensor, related wire or wrong installation Vacuum leakage Engine overheating Low engine compression Ignition system malfunction Poor fuel quality PCV valve malfunction Air cleaner restriction Restriction in exhaust system Electrical connector disconnection Open or short circuit in fuel pump body and related harness No battery power supply to PCM or poor GND Inadequate fuel pressure Fuel pump body mechanical malfunction Fuel leakage from fuel injector Fuel injector clogging Ignition coil malfunction Improper air/fuel mixture ratio control Improper valve timing Improper operation variable valve timing control system Immobilizer system (PATS) and/or circuit malfunction Pressure regulator 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 6 CRANKS NORMALLY BUT WILL NOT START [L3]
| 6 | CRANKS NORMALLY BUT WILL NOT START |
|---|
| DESCRIPTION | Starter cranks engine at normal speed but engine will not run. Refer to symptom troubleshooting " NO.5 ENGINE STALLS " if this symptom appears after engine stall. Fuel is in tank. Battery is in normal condition. |
| POSSIBLE CAUSE | No battery power supply to PCM Air leakage from intake-air system Open PCM GND or vehicle body GND Improper operation of electronic throttle control system EGR valve malfunction 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 Low engine compression Engine overheating Vacuum leakage Ignition system malfunction Improper air/fuel mixture ratio control Poor fuel quality PCV valve malfunction Air cleaner restriction Restriction in exhaust system Disconnected electrical connector Open or short circuit in fuel pump body and related harness Inadequate fuel pressure Fuel pump mechanical malfunction Fuel leakage from injector Fuel injector is clogged. Purge solenoid valve malfunction Spark plug malfunction Ignition coil malfunction Improper variable valve timing control system operation Improper valve timing Immobilizer system (PATS) and/or circuit malfunction Pressure regulator 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 7 SLOW RETURN TO IDLE [L3]
| 7 | SLOW RETURN TO IDLE |
|---|
| DESCRIPTION | Engine takes more time than normal to return to idle speed. |
| POSSIBLE CAUSE | ECT sensor malfunction Thermostat is stuck open. Throttle body malfunction Air leakage from intake-air system |
POSSIBLE CAUSE DESCRIPTION
NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [L3]
| 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 | Air leakage from intake-air system parts A/C system operation is improper Erratic signal to ignition coil Spark plug malfunction Purge solenoid valve malfunction Improper operation of electronic throttle control system EGR valve malfunction Erratic or no signal from CMP sensor Low engine compression Improper valve timing Improper variable valve timing control system operation Erratic signal from CKP sensor Poor fuel quality PCV valve malfunction Air cleaner restriction Restriction in exhaust system Disconnected electrical connectors Inadequate fuel pressure Fuel pump body mechanical malfunction Improper load signal input Fuel line restriction or clogging Improper fuel injection control operation Fuel leakage from fuel injector Fuel injector clogging Engine overheating Vacuum leakage Pressure regulator malfunction WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 fuel system diagnosis and repair procedures. Read 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 9 FAST IDLE/RUNS ON [L3]
| 9 | FAST IDLE/RUNS ON |
|---|
| DESCRIPTION | Engine speed continues during fast idle after warm-up. Engine runs after ignition switch is turned off. |
| POSSIBLE CAUSE | ECT sensor malfunction Air leakage from intake-air system Throttle body malfunction Accelerator position sensor misadjustment Cruise control system operating improperly Improper load signal input Improper operation of electronic throttle control system |
POSSIBLE CAUSE DESCRIPTION
NO. 10 LOW IDLE/STALLS DURING DECELERATION [L3]
| 10 | LOW IDLE/STALLS DURING DECELERATION |
|---|
| DESCRIPTION | Engine stops unexpectedly at beginning of deceleration or recovery from deceleration. |
| POSSIBLE CAUSE | Vacuum leakage Improper operation of electronic throttle control system Air leakage from intake-air system Improper air/fuel mixture ratio control EVAP control system malfunction Accelerator position sensor or related circuit malfunction Accelerator position sensor misadjustment TP sensor or related circuit malfunction MAF sensor or related circuit malfunction Brake switch or related circuit malfunction Neutral/clutch pedal position switch or related circuit malfunction (MTX) TR switch or related circuit malfunction (ATX) Improper A/C magnetic clutch operation |
POSSIBLE CAUSE DESCRIPTION
NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [L3]
| 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 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 | A/C system operation is improper. Erratic signal or no signal from CMP sensor Air leakage from intake-air system parts Purge solenoid valve malfunction Improper operation of electronic throttle control system EGR valve malfunction Erratic signal from CKP sensor Low engine compression Vacuum leakage Poor fuel quality Main relay intermittent malfunction Throttle body malfunction Engine overheating Spark plug malfunction Improper air/fuel mixture ratio control operation Improper Variable tumble system operation Air cleaner restriction PCV valve malfunction Improper valve timing due to jumping out timing chain Restriction in exhaust system Intermittent open or short in fuel body pump circuit Inadequate fuel pressure Fuel pump mechanical malfunction Fuel leakage from fuel injector Fuel injector clogging Fuel line restriction or clogging Pressure regulator malfunction Accelerator position sensor misadjustment TP sensor misadjustment Intermittent open or short of MAF sensor, TP sensor, Accelerator position sensor and VSS ATX malfunction (ATX) Clutch slippage (MTX) Improper Variable intake air system operation 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [L3]
| 12 | LACK/LOSS OF POWER - ACCELERATION/CRUISE |
|---|
| DESCRIPTION | Performance is poor under load (e.g., power down when climbing hills). |
| POSSIBLE CAUSE | Improper A/C system operation Erratic signal or no signal from CMP sensor Air leakage from intake-air system parts Improper Variable intake air system operation Improper Variable tumble system operation Improper operation of electronic throttle control system Purge control solenoid malfunction EGR valve malfunction Brake dragging Erratic signal from CKP sensor Low engine compression Vacuum leakage Poor fuel quality Engine overheating Throttle body malfunction Spark plug malfunction Air cleaner restriction PCV valve malfunction Improper valve timing due to jumping out of timing chain Improper variable valve timing control operation Restriction in exhaust system Intermittent open or short in fuel pump related circuit Inadequate fuel pressure Fuel pump mechanical malfunction Fuel line restriction or clogging Fuel leakage from fuel injector Fuel injector clogging Intermittent open or short circuit in MAF sensor, Accelerator position sensor, TP sensor and VSS ATX malfunction (ATX) Clutch slippage (MTX) 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [L3]
| 13 | KNOCKING/PINGING - ACCELERATION/CRUISE |
|---|
| DESCRIPTION | Sound is produced when air/fuel mixture is ignited by something other than spark plug (e.g., hot spot in combustion chamber). |
| POSSIBLE CAUSE | Engine overheating due to cooling system malfunction ECT sensor malfunction IAT sensor malfunction MAF sensor malfunction Knock sensor malfunction Erratic signal from CMP sensor Inadequate engine compression Inadequate fuel pressure 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 14 POOR FUEL ECONOMY [L3]
| 14 | POOR FUEL ECONOMY |
|---|
| DESCRIPTION | Fuel economy is unsatisfactory. |
| POSSIBLE CAUSE | Contaminated air cleaner element Variable intake air system malfunction Engine cooling system malfunction Improper ATF level (ATX) Weak spark Poor fuel quality Erratic or no signal from CMP sensor Clutch slippage (MTX) Variable tumble system malfunction Improper variable valve timing control system operation Improper coolant level Inadequate fuel pressure Spark plug malfunction PCV valve malfunction Brake dragging Improper valve timing due to jumping out of timing chain Contaminated MAF sensor Improper engine compression Exhaust system clogging WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 15 EMISSION COMPLIANCE [L3]
| 15 | EMISSION COMPLIANCE |
|---|
| DESCRIPTION | Fails emissions test. |
| POSSIBLE CAUSE | Vacuum lines leakage or blockage Cooling system malfunction Spark plug malfunction Leakage from intake manifold Erratic or no signal from CMP sensor Inadequate fuel pressure PCV valve malfunction or incorrect valve installation EGR valve malfunction Exhaust system clogging Fuel tank ventilation system malfunction Charcoal canister damage Air cleaner element clogging or restriction Throttle body malfunction Improper air/fuel mixture ratio control operation Catalyst converter malfunction Engine internal parts malfunction Excessive carbon is built up in combustion chamber Improper engine compression Improper valve timing WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 16 HIGH OIL CONSUMPTION/LEAKAGE [L3]
| 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 |
POSSIBLE CAUSE DESCRIPTION
NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [L3]
| 17 | COOLING SYSTEM CONCERNS-OVERHEATING |
|---|
| DESCRIPTION | Engine runs at higher than normal temperature/overheats. |
| POSSIBLE CAUSE | Improper coolant level Blown fuses Coolant leakage Excessive A/C system pressure A/C system operation is improper Improper water/anti-freeze mixture Fans reverse rotation Poor radiator condition Thermostat malfunction Radiator hoses damage Condenser fan is inoperative. Improper or damaged radiator cap Cooling fan is inoperative. Coolant overflow system malfunction Improper tension of drive belt Drive belt damage |
POSSIBLE CAUSE DESCRIPTION
NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD [L3]
| 18 | COOLING SYSTEM CONCERNS-RUNS COLD |
|---|
| DESCRIPTION | Engine takes excessive time to reach normal operating temperature. |
| POSSIBLE CAUSE | Thermostat malfunction Condenser fan system malfunction Cooling fan system malfunction |
POSSIBLE CAUSE DESCRIPTION
NO. 19 EXHAUST SMOKE [L3]
| 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. Fuel return line is restricted. Excessive fuel pressure Improper engine compression Injector fuel leakage Ignition system malfunction WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 20 FUEL ODOR (IN ENGINE COMPARTMENT) [L3]
| 20 | FUEL ODOR (IN ENGINE COMPARTMENT) |
|---|
| DESCRIPTION | Gasoline fuel smell or visible leakage |
| POSSIBLE CAUSE | Excessive fuel pressure Purge solenoid valve malfunction Fuel tank vent system blockage Charcoal canister malfunction Fuel leakage from fuel system WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 23 A/C DOES NOT WORK SUFFICIENTLY [L3]
| 23 | A/C DOES NOT WORK SUFFICIENTLY. |
|---|
| DESCRIPTION | A/C compressor magnetic clutch does not engage when A/C switch is turned on. |
| POSSIBLE CAUSE | Improper refrigerant charging amount Open A/C magnetic clutch Open circuit between A/C relay and A/C magnetic clutch Poor GND of A/C magnetic clutch Refrigerant pressure switch is stuck open. A/C relay is stuck open. Seized A/C compressor Open circuit between A/C switch and PCM through both refrigerant pressure switch and A/C amplifier |
POSSIBLE CAUSE DESCRIPTION
NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [L3]
| 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 GND between A/C switch and PCM Short to GND circuit between A/C relay and PCM A/C relay to magnetic clutch circuit shorted to battery power |
POSSIBLE CAUSE DESCRIPTION
NO. 25 A/C IS NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [L3]
| 25 | A/C IS NOT CUT OFF UNDER WOT CONDITIONS. |
|---|
| DESCRIPTION | A/C compressor magnetic clutch does not disengage under WOT. |
| POSSIBLE CAUSE | Accelerator position sensor malfunction Accelerator position sensor misadjustment Loosely installed accelerator position sensor. |
POSSIBLE CAUSE DESCRIPTION
NO. 26 EXHAUST SULPHUR SMELL [L3]
| 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 fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 fuel system diagnosis and repair procedures. Read following warnings before servicing 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 28 FUEL FILLING SHUT OFF ISSUES [L3]
| 28 | Fuel filling shut off issues |
|---|
| 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
NO. 29 SPARK PLUG CONDITION [L3]
| 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 Faulty spark plug Grayish white with specific plug: Air/fuel mixture-Insufficient fuel injection volume Faulty spark plug Wet/carbon is stuck on all plugs: Spark-Spark weak Air/fuel mixture-Too rich Compression-Low compression Clogging in intake/exhaust system Grayish white with all plugs: Air/fuel mixture-Too lean 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). CAUTION: Disconnecting/connecting quick release connector without cleaning it may possibly 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 REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE [L3, AJ] ). (See AFTER REPAIR PROCEDURE [L3, AJ] ). |
| CAUTION |
|---|
| Disconnecting/connecting quick release connector without cleaning it may possibly 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. |
POSSIBLE CAUSE DESCRIPTION
Water Sprinkling Method
If malfunction occurs only during high humidity or rainy/snowy weather, perform the following steps
| CAUTION | Indirectly change the temperature and humidity by spraying water onto the front of the radiator. If a vehicle is subject to water leakage, the leakage may damage the control module. When testing a vehicle with a water leakage problem, special caution must be used. |
Scheme 175
- Connect M-MDS to DLC-2 if you are inspecting sensors or switches.
- Turn ignition switch to ON position (Engine off). NOTE: If engine starts and runs, perform the following steps at idle.
- Access PIDs for sensor or switch if you are inspecting sensors or switches.
- If you are inspecting the switch, turn it on manually.
- Spray water onto the vehicle or run it through a car wash. If PID value is unstable or malfunction occurs, repair or replace part if necessary.
Input Signal System Investigation Procedure
- Find an unusual signal. (See «FINDING UNUSUAL SIGNALS»(ref-288783-S13887364752008062500000) ).
- Locate the source. (See «LOCATING THE SOURCE OF UNUSUAL SIGNALS»(ref-288783-S28112672092008062500000) ).
- Repair or replace the defective part.
- Confirm that the unusual signal has been erased.
Finding unusual signals
While referring to 01-02A-11 ON-BOARD DIAGNOSTIC TEST [L3], 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 specifications by a wide margin are unusual.
- When recreating the problem, any sudden change in monitor input signals that is not consciously created by the driver can be judged as unusual.
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 done, 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 harness or terminal from water damage, leading to problems with the vehicle. |
Scheme 176
Scheme 176: Investigate the input signal system for variable resistance type 1
- When an unusual signal is received, measure the #1 PCM terminal voltage. If the #1 terminal voltage and the M-MDS monitor voltage are the same, proceed to the next step. If there is a difference of 0.5 V or more , inspect for the following points concerning the PCM connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
- Measure the #2 sensor terminal voltage. If there is a 0.5 V or more difference between the sensor and M-MDS voltages, inspect the harness for open or short circuits. If the sensor and M-MDS voltages are the same, inspect for the following points concerning the sensor connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) If there are no problems, proceed to next investigation below.
Investigate the standard power supply system for variable resistance type 1
- Confirm that the #3 terminal is at 5 V . If the measured voltage on the #3 terminal is 5 V , inspect the following points on the sensor connector. If there is no problem, inspect for the following: Female terminal opening loose Coupler (pin holder) damage Pin discoloration (blackness) If the #3 terminal measures other than 5 V , inspect for the following: Open or short circuit in harness Harness/pin crimp is loose or disconnected.
Investigate the GND system for variable resistance type 1
- Confirm that terminal sensor #5 is at 0 V . If it is at 0 V , inspect the sensor. If necessary, replace the sensor. If not, inspect for the following: Open or short circuit in harness Female terminal opening is loose causing an open or short circuit in harness Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
Scheme 177
Scheme 177: Variable resistance type 2 (fuel tank level sensor and mass air flow (MAF) sensor)
Investigate the GND system for variable resistance type 2
- Confirm that terminal sensor #4 is at 0 V . If it is at 0 V , inspect the sensor. If necessary, replace the sensor. If not at 0 V , inspect for the following: Open circuit in harness Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
Investigate the input signal system for variable resistance type 2
- When an unusual signal is received, measure the #1 PCM terminal voltage. If the #1 terminal voltage and the M-MDS monitor voltage are the same, proceed to the next step. If there is a difference of 0.5 V or more , inspect for the following points concerning the PCM connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
- Measure the #2 sensor terminal voltage. If there is a 0.5 V or more difference between the sensor and M-MDS voltages, inspect the harness for open or short circuits. If the sensor and M-MDS voltages are the same, inspect the following points concerning the sensor connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected. If there are no problems, proceed to next investigation below.
Investigate the electrical supply system for variable resistance type 2
- Confirm that the sensor #3 terminal is B+ . If the measured voltage on the #3 terminal is B+ , inspect the following points on the sensor connector. If there is no problem, inspect for the following: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) If the #3 terminal measures other than B+ , inspect the following: Open or short circuit in harness Harness/pin crimp is loose or disconnected.
Scheme 178
Scheme 178: Thermistor type (IAT sensor and ECT sensor)
Investigate the input signal system for thermistor type
- When an unusual signal is received, measure the #1 PCM terminal voltage. If the #1 terminal voltage and the M-MDS monitor voltage are the same, proceed to the next step. If there is a difference of 0.5 V or more , inspect the following points concerning the PCM connector: Female terminal opening loose Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
- Measure the #2 sensor terminal voltage. If there is a 0.5 V or more difference between the sensor and M-MDS voltages, inspect the harness for open or short circuits. If the sensor and M-MDS voltages are the same, inspect the following points concerning the sensor connector: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected. If there are no problems, proceed to next investigation below.
Investigate the GND system for thermistor type
- Confirm that terminal sensor #3 is at 0 V . If it is at 0 V , inspect the sensor. If necessary, replace the sensor. If not, inspect for the following: Open circuit in harness Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
Scheme 179
- Measure the #1 PCM terminal voltage and confirm that it is at 0 V or 5 V when the ignition switch at ON and the engine at idle. If it is at 0 V or 5 V , intermittent concern exists. (See «INTERMITTENT CONCERN TROUBLESHOOTING [L3]»(ref-288783-S03884972102008062500000) ). If not, inspect the following points concerning the PCM connector. If there is no problem, inspect for the following: Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
- Measure the #2 sensor terminal voltage and confirm that it is at 0 V or 5 V when the ignition switch at ON and the engine at idle. If it is at 0 V or 5 V , intermittent concern exists. (See «INTERMITTENT CONCERN TROUBLESHOOTING [L3]»(ref-288783-S03884972102008062500000) ). If not, inspect the following points concerning the sensor connector: If there is no problem, inspect for the following. Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
- Confirm that the #3 terminal switch voltage is at 0 V . If it is at 0 V , inspect the sensor. If necessary, replace the sensor. If necessary, replace the sensor. If not, inspect for the following: Open circuit in harness Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
When idling cannot be continued
- Remove the oil control valve (OCV) and verify that the spool valve is at maximum retard position.
- Connect the oil control valve (OCV).
- Turn the ignition switch to ON position.
- Verify that the spool valve is at maximum retard position. If the spool valve is stuck in the advance direction, inspect for the following: Short circuit in harnesses or connectors between the oil control valve (OCV) and the PCM.
- Inspect the variable timing actuator.
When idling can be continued
- Disconnect oil control valve (OCV) connector.
- Warm up the engine and idle it.
- Apply battery voltage to the oil control valve (OCV) and verify that the engine idles roughly or stalls. If the engine idles roughly or stalls, inspect the timing chain component (valve timing deviation). If the engine does not idle roughly or stalls, go to the next step.
- Remove the oil control valve (OCV) and perform spool valve operation inspection. (See «OIL CONTROL VALVE (OCV) INSPECTION [L3]»(ref-288763-S07350514452008062500000) ). If not as specified, inspect the following: Oil control valve (OCV) Harnesses and connectors between oil control valve (OCV) and PCM open or short. If as specified, inspect the following hydraulic passages for clogging or leakage or both: Oil pressure switch - oil control valve (OCV) Oil control valve (OCV) - camshaft Camshaft internal passage
- If they are okay, replace the camshaft pulley (with built-in variable valve timing actuator).
![Scheme 174: NO. 1 MELTING OF MAIN OR OTHER FUSES [L3]](https://i.diagnostdata.com/repair/e8/e8550d794f22b446bc2d4404e7d13ca84adcce3b5d66a4c303eed66c9e78206f.webp)
