Symptom Troubleshooting [Engine Controls MZI-3.7]: Other — Mazda CX-9 I рестайлинг (2012-2016)

NO. 1 MELTING OF MAIN OR OTHER FUSES [MZI-3.7]

NO. 1 MELTING OF MAIN FUSE REFERENCE CHART (MZI-3.7) 1 MELTING OF MAIN OR OTHER FUSES [TROUBLESHOOTING HINTS] Inspect condition of fuse

Scheme 21

Scheme 21: NO. 1 MELTING OF MAIN OR OTHER FUSES [MZI-3.7]

Damaged fuse	Related wiring harness
MAIN	MAIN fuse IGKEY2 fuse Ignition switch Generator FAN1 fuse Cooling fan relay (Single fan control module) Fan control module (Single fan control module) Cooling fan relay No. 1 (Dual fan control module) Fan control module No. 1 (Dual fan control module) FAN2 fuse Cooling fan relay (Single fan control module) Fan control module (Single fan control module) Cooling fan relay No. 2 (Dual fan control module) Fan control module No. 2 (Dual fan control module) A/C MAG fuse A/C relay
IGKEY1	IGKEY1 fuse Ignition switch ENG.IGA fuse
IG KEY2	IGKEY2 fuse Ignition switch STA fuse Starter relay Starter
ENG.IGA	ENG.IGA fuse PCM Diode Fuel pump relay Fan relay (Single fan control module) Cooling fan relay No. 1 (Dual fan control module) Cooling fan relay No. 2 (Dual fan control module)
FUEL PUMP	FUEL PUMP fuse Fuel pump relay Fuel pump PCM INJ fuse
FAN1	FAN 1 fuse Fan relay Fan control module (Single fan control module) Cooling fan relay No. 1 (Dual fan control module) Fan control module No. 1 (Dual fan control module)
FAN 2	FAN 2 fuse Fan relay Fan control module (Single fan control module) Cooling fan relay No. 2 (Dual fan control module) Fan control module No. 2 (Dual fan control module)
ENG+B	ENG+B fuse Generator CV solenoid valve PCM
STA	STA fuse PCM Diode Starter relay PCM
ENG BAR	ENG BAR fuse Front HO2S (RH) Front HO2S (LH) Rear HO2S (RH) Rear HO2S (LH) Oil control valve (RH) Oil control valve (LH) Mass air flow/intake air temperature sensor Purge solenoid valve Brake switch No. 2 PCM
ENG BAR2	ENG BAR2 fuse A/C relay
ENG INJ	ENG INJ fuse PCM
INJ	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
IG COIL	IG COIL 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
A/C MAG	A/C MAG fuse A/C relay Magnetic clutch

DAMAGED FUSE REFERENCE CHART

NO. 2 MIL ILLUMINATES [MZI-3.7]

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.

NO. 2 MIL ILLUMINATES REFERENCE CHART (MZI-3.7)

NO. 3 WILL NOT CRANK [MZI-3.7]

3	WILL NOT CRANK
DESCRIPTION	The starter does not work.
POSSIBLE CAUSE	Advanced keyless entry and start system malfunction Immobilizer system operating properly. (Ignition key is not registered) Immobilizer system and/or circuit malfunction Coil antenna connector or terminal malfunction Immobilizer system malfunction Coil antenna related circuit malfunction Low or dead battery Charging system malfunction TR switch malfunction TR switch misadjustment Open or short circuit in wiring harness between starter relay and PCM Open or short circuit in wiring harness between starter relay and ignition switch Ignition switch related circuit malfunction Open or short circuit in wiring harness between starter relay and battery positive terminal Open or short circuit in wiring harness between starter relay and starter Starter malfunction Seized/hydrolocked engine, drive plate PCM DTC is stored

WILL NOT CRANK

DESCRIPTION

The starter does not work.

POSSIBLE CAUSE

Advanced keyless entry and start system malfunction Immobilizer system operating properly. (Ignition key is not registered) Immobilizer system and/or circuit malfunction Coil antenna connector or terminal malfunction Immobilizer system malfunction Coil antenna related circuit malfunction Low or dead battery Charging system malfunction TR switch malfunction TR switch misadjustment Open or short circuit in wiring harness between starter relay and PCM Open or short circuit in wiring harness between starter relay and ignition switch Ignition switch related circuit malfunction Open or short circuit in wiring harness between starter relay and battery positive terminal Open or short circuit in wiring harness between starter relay and starter Starter malfunction Seized/hydrolocked engine, drive plate PCM DTC is stored

NO. 3 WILL NOT CRANK REFERENCE CHART (MZI-3.7)

NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [MZI-3.7]

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 GND 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 PCV valve 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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 GND 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 PCV valve 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

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.

NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK REFERENCE CHART (MZI-3.7)

NO. 5 ENGINE STALLS-AFTER START/AT IDLE [MZI-3.7]

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 GND 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 body and related wiring harness Fuel pump body 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 the 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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 GND 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 body and related wiring harness Fuel pump body 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 the 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 5 ENGINE STALLS-AFTER START/AT IDLE REFERENCE CHART (MZI-3.7)

NO. 6 CRANKS NORMALLY BUT WILL NOT START [MZI-3.7]

6	CRANKS NORMALLY BUT WILL NOT START
DESCRIPTION	The starter cranks engine at normal speed but the 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	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 GND or vehicle body GND 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 PCM valve malfunction Purge solenoid valve malfunction Air Leakage in intake air system when the 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

CRANKS NORMALLY BUT WILL NOT START

DESCRIPTION

The starter cranks engine at normal speed but the 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

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 GND or vehicle body GND 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 PCM valve malfunction Purge solenoid valve malfunction Air Leakage in intake air system when the 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 6 CRANKS NORMALLY BUT WILL NOT START REFERENCE CHART (MZI-3.7)

NO. 7 SLOW RETURN TO IDLE [MZI-3.7]

7	SLOW RETURN TO IDLE
DESCRIPTION	Engine takes more time than normal to return to idle speed.
POSSIBLE CAUSE	CHT sensor malfunction Thermostat is stuck open. Erratic signal from PSP switch Throttle body malfunction Air leakage from intake-air system

NO. 7 SLOW RETURN TO IDLE REFERENCE CHART (MZI-3.7)

NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [MZI-3.7]

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 electronic throttle 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 PSP 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 body 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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 electronic throttle 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 PSP 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 body 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

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.

NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE REFERENCE CHART (MZI-3.7)

NO. 9 FAST IDLE/RUNS ON [MZI-3.7]

9	FAST IDLE/RUNS ON
DESCRIPTION	The engine speed continues at fast idle after warm-up. The engine runs after the ignition switch is turned 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 front climate control unit terminal 2A and instrument cluster terminal 1C 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 Accelerator pedal position sensor misadjustment

FAST IDLE/RUNS ON

DESCRIPTION

The engine speed continues at fast idle after warm-up. The engine runs after the ignition switch is turned 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 front climate control unit terminal 2A and instrument cluster terminal 1C 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 Accelerator pedal position sensor misadjustment

NO. 9 FAST IDLE/RUNS ON REFERENCE CHART (MZI-3.7)

NO. 10 LOW IDLE/STALLS DURING DECELERATION [MZI-3.7]

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 routine vacuum line PCM DTC is stored Improper operation of drive-by-wire control system EVAP control system malfunction Erratic signal to PCM Accelerator pedal position 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

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 routine vacuum line PCM DTC is stored Improper operation of drive-by-wire control system EVAP control system malfunction Erratic signal to PCM Accelerator pedal position 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

NO. 10 LOW IDLE/STALLS DURING DECELERATION REFERENCE CHART (MZI-3.7)

NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZI-3.7]

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	Drive-by-wire control system operates with brake override system 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 is overheating Throttle body restriction or clogged Throttle body malfunction 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 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 in 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 ration 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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

Drive-by-wire control system operates with brake override system 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 is overheating Throttle body restriction or clogged Throttle body malfunction 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 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 in 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 ration 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES REFERENCE CHART (MZI-3.7)

NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZI-3.7]

12	LACK/LOSS OF POWER-ACCELERATION/CRUISE
DESCRIPTION	Performance is poor under load (such as power down when climbing hills).
POSSIBLE CAUSE	Drive-by-wire control system operates with brake override system. 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

LACK/LOSS OF POWER-ACCELERATION/CRUISE

DESCRIPTION

Performance is poor under load (such as power down when climbing hills).

POSSIBLE CAUSE

Drive-by-wire control system operates with brake override system. 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE REFERENCE CHART (MZI-3.7)

NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.7]

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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE REFERENCE CHART (MZI-3.7)

NO. 14 POOR FUEL ECONOMY [MZI-3.7]

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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

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.

NO. 14 POOR FUEL ECONOMY REFERENCE CHART (MZI-3.7)

NO. 15 EMISSION COMPLIANCE [MZI-3.7]

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 malfunction 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 clogging Pressure regulator malfunction (built-in fuel pump unit) Improper air/fuel mixture ratio control operation Bend or open circuit A/F sensor wiring harness Erratic or no signal from CMP sensor Exhaust system clogging Improper engine compression PCV valve malfunction or incorrect valve installation 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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 malfunction 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 clogging Pressure regulator malfunction (built-in fuel pump unit) Improper air/fuel mixture ratio control operation Bend or open circuit A/F sensor wiring harness Erratic or no signal from CMP sensor Exhaust system clogging Improper engine compression PCV valve malfunction or incorrect valve installation 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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

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.

NO. 15 EMISSION COMPLIANCE REFERENCE CHART (MZI-3.7)

NO. 16 HIGH OIL CONSUMPTION/LEAKAGE [MZI-3.7]

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

NO. 16 HIGH OIL CONSUMPTION/LEAKAGE REFERENCE CHART (MZI-3.7)

NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7]

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 Excessive A/C system pressure 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)

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 Excessive A/C system pressure 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)

NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING REFERENCE CHART (MZI-3.7)

NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI-3.7]

18	COOLING SYSTEM CONCERNS-RUNS COLD
DESCRIPTION	Engine takes excessive time to reach normal operating temperature.
POSSIBLE CAUSE	A/C and heater system malfunction Cooling fan system malfunction Thermostat malfunction Improper water temperature gauge operation CHT sensor malfunction Instrument cluster malfunction

NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD REFERENCE CHART (MZI-3.7)

NO. 19 EXHAUST SMOKE [MZI-3.7]

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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 19 EXHAUST SMOKE REFERENCE CHART (MZI-3.7)

NO. 20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI-3.7]

20	FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION	Gasoline fuel smell or visible leakage
POSSIBLE CAUSE	Fuel leakage from fuel system Excessive fuel 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

FUEL ODOR (IN ENGINE COMPARTMENT)

DESCRIPTION

Gasoline fuel smell or visible leakage

POSSIBLE CAUSE

Fuel leakage from fuel system Excessive fuel 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 20 FUEL ODOR (IN ENGINE COMPARTMENT) REFERENCE CHART (MZI-3.7)

NO. 23 A/C DOES NOT WORK SUFFICIENTLY [MZI-3.7]

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 or climate control unit DTC is stored Refrigerant pressure sensor malfunction Improper refrigerant charging amount Seized A/C compressor Front evaporator temperature sensor malfunction Open or short circuit in wiring harness between front evaporator temperature sensor and front climate control unit Instrument cluster malfunction (Does not receive A/C request signal from climate control unit or transmit it to PCM) 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 front climate control unit terminal 2A and instrument cluster terminal 1C A/C compressor malfunction Open circuit in wiring harness between magnetic clutch terminal A and body ground A/C relay malfunction Open circuit in wiring harness between A/C relay and PCM terminal 2W Open circuit in wiring harness between main relay No. 1 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

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 or climate control unit DTC is stored Refrigerant pressure sensor malfunction Improper refrigerant charging amount Seized A/C compressor Front evaporator temperature sensor malfunction Open or short circuit in wiring harness between front evaporator temperature sensor and front climate control unit Instrument cluster malfunction (Does not receive A/C request signal from climate control unit or transmit it to PCM) 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 front climate control unit terminal 2A and instrument cluster terminal 1C A/C compressor malfunction Open circuit in wiring harness between magnetic clutch terminal A and body ground A/C relay malfunction Open circuit in wiring harness between A/C relay and PCM terminal 2W Open circuit in wiring harness between main relay No. 1 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

NO. 23 A/C DOES NOT WORK SUFFICIENTLY REFERENCE CHART (MZI-3.7)

NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7]

24	A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.
DESCRIPTION	A/C compressor magnetic clutch does not disengage.
POSSIBLE CAUSE	PCM and instrument cluster DTC is stored. Short to power supply in wiring harness between A/C relay and magnetic clutch Magnetic clutch engagement is stuck. A/C relay malfunction Short to GND in wiring harness between A/C switch and PCM Short to ground in wiring harness between front climate control unit terminal 2A and instrument cluster Climate control unit malfunction Instrument cluster malfunction

A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.

DESCRIPTION

A/C compressor magnetic clutch does not disengage.

POSSIBLE CAUSE

PCM and instrument cluster DTC is stored. Short to power supply in wiring harness between A/C relay and magnetic clutch Magnetic clutch engagement is stuck. A/C relay malfunction Short to GND in wiring harness between A/C switch and PCM Short to ground in wiring harness between front climate control unit terminal 2A and instrument cluster Climate control unit malfunction Instrument cluster malfunction

NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY REFERENCE CHART (MZI-3.7)

NO. 25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [MZI-3.7]

25	A/C DOES NOT CUT OFF UNDER WOT CONDITIONS.
DESCRIPTION	A/C compressor magnetic clutch does not disengage under WOT.
POSSIBLE CAUSE	Accelerator pedal position sensor malfunction Loosely installed accelerator pedal position sensor

NO. 25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS REFERENCE CHART (MZI-3.7)

NO. 26 EXHAUST SULPHUR SMELL [MZI-3.7]

26	EXHAUST SULPHUR SMELL
DESCRIPTION	Rotten egg smell (sulphur) from exhaust
POSSIBLE CAUSE	Electrical connectors are disconnected or connected poorly Vacuum lines are disconnected or connected improperly. Poor fuel quality PCM DTC is stored Improper fuel line 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) Charcoal canister 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

EXHAUST SULPHUR SMELL

DESCRIPTION

Rotten egg smell (sulphur) from exhaust

POSSIBLE CAUSE

Electrical connectors are disconnected or connected poorly Vacuum lines are disconnected or connected improperly. Poor fuel quality PCM DTC is stored Improper fuel line 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) Charcoal canister 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.)

WARNING

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.

NO. 26 EXHAUST SULPHUR SMELL REFERENCE CHART (MZI-3.7)

NO. 28 FUEL FILLING SHUT OFF CONCERNS [MZI-3.7]

28	FUEL FILLING SHUT OFF CONCERNS
DESCRIPTION	Fuel does not shut off properly.
POSSIBLE CAUSE	Clogged EVAP pipes Nonreturn 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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.

FUEL FILLING SHUT OFF CONCERNS

DESCRIPTION

Fuel does not shut off properly.

POSSIBLE CAUSE

Clogged EVAP pipes Nonreturn 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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

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.

NO. 28 FUEL FILLING SHUT OFF CONCERNS REFERENCE CHART (MZI-3.7)

NO. 29 SPARK PLUG CONDITION [MZI-3.7]

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-Spark weak Air/fuel mixture-Too rich, excessive 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 Compression-Low compression Clogging in intake/exhaust system 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 service information. (See BEFORE SERVICE PRECAUTION [MZI-3.7] article.) (See AFTER SERVICE PRECAUTION [MZI-3.7] article.) 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

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.

NO. 29 SPARK PLUG CONDITION REFERENCE CHART (MZI-3.7)

Water Sprinkling Method

If malfunction occurs only under 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 22

Connect the M-MDS to the DLC-2 if you are inspecting sensors or switches.
Turn the ignition switch to the ON position (Engine off). NOTE: If the 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.

Finding irregular signals

While referring to ON-BOARD DIAGNOSTIC TEST [MZI-3.7] article , 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 23

Scheme 23: Variable resistance TP Sensor type 1

Symptom Troubleshooting [Engine Controls MZI-3.7]: Other Mazda CX-9 I рестайлинг

NO. 1 MELTING OF MAIN OR OTHER FUSES [MZI-3.7]

Scheme 21

NO. 2 MIL ILLUMINATES [MZI-3.7]

NO. 3 WILL NOT CRANK [MZI-3.7]

NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [MZI-3.7]

NO. 5 ENGINE STALLS-AFTER START/AT IDLE [MZI-3.7]

NO. 6 CRANKS NORMALLY BUT WILL NOT START [MZI-3.7]

NO. 7 SLOW RETURN TO IDLE [MZI-3.7]

NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [MZI-3.7]

NO. 9 FAST IDLE/RUNS ON [MZI-3.7]

NO. 10 LOW IDLE/STALLS DURING DECELERATION [MZI-3.7]

NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZI-3.7]

NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZI-3.7]

NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.7]

NO. 14 POOR FUEL ECONOMY [MZI-3.7]

NO. 15 EMISSION COMPLIANCE [MZI-3.7]

NO. 16 HIGH OIL CONSUMPTION/LEAKAGE [MZI-3.7]

NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7]

NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI-3.7]

NO. 19 EXHAUST SMOKE [MZI-3.7]

NO. 20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI-3.7]

NO. 23 A/C DOES NOT WORK SUFFICIENTLY [MZI-3.7]

NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7]

NO. 25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [MZI-3.7]

NO. 26 EXHAUST SULPHUR SMELL [MZI-3.7]

NO. 28 FUEL FILLING SHUT OFF CONCERNS [MZI-3.7]

NO. 29 SPARK PLUG CONDITION [MZI-3.7]

Water Sprinkling Method

Scheme 22

Finding irregular signals

Locating the source of unusual signals

Scheme 23

More articles — Symptom Troubleshooting [Engine Controls MZI-3.7]

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