SYMPTOM DIAGNOSTIC INDEX [MZI-3.7]
- Confirm trouble symptom using the following diagnostic index, then go to appropriate troubleshooting chart.
| No. | TROUBLESHOOTING ITEM | DESCRIPTION | Action |
|---|
| 1 | Melting of main or other fuses | | See NO. 1 MELTING OF MAIN OR OTHER FUSES [MZI-3.7] . |
| 2 | MIL illuminates | The MIL is illuminated incorrectly. | See NO. 2 MIL ILLUMINATES [MZI-3.7] . |
| 3 | Will not crank | The starter does not work. | See NO. 3 WILL NOT CRANK [MZI-3.7] . |
| 4 | Hard to start/long crank/erratic start/erratic crank | The starter cranks the engine at normal speed but the engine requires excessive cranking time before starting. | See NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [MZI-3.7] . |
| 5 | Engine stalls. | After start/at idle | The engine stops unexpectedly at idle and/or after start or both. | See NO. 5 ENGINE STALLS-AFTER START/AT IDLE [MZI-3.7] . |
| 6 | Cranks normally but will not start | The starter cranks engine at normal speed but the engine will not run. | See NO. 6 CRANKS NORMALLY BUT WILL NOT START [MZI-3.7] . |
| 7 | Slow return to idle | The engine takes more time than normal to return to idle speed. | See NO. 7 SLOW RETURN TO IDLE [MZI-3.7] . |
| 8 | Engine runs rough/rolling idle. | The engine speed fluctuates between the specified idle speed and lower speed and the engine shakes excessively. | See NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [MZI-3.7] . |
| 9 | Fast idle/runs on | The engine speed continues at fast idle after warm-up. The engine runs after the ignition switch is turned off. | See NO. 9 FAST IDLE/RUNS ON [MZI-3.7] . |
| 10 | Low idle/stalls during deceleration | The engine stops unexpectedly at the beginning of deceleration or recovery from deceleration. | See NO. 10 LOW IDLE/STALLS DURING DECELERATION [MZI-3.7] . |
| 11 | Engine stalls/quits. | Acceleration/cruise | The engine stops unexpectedly at the beginning of acceleration or during acceleration. The engine stops unexpectedly while cruising. | See NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZI-3.7] . |
| Engine runs rough. | Acceleration/cruise | The engine speed fluctuates during acceleration or cruising. |
| Misses | Acceleration/cruise | The engine misses during acceleration or cruising. |
| Buck/jerk | Acceleration/cruise/deceleration | The vehicle bucks/jerks during acceleration, cruising, or deceleration. |
| Hesitation/stumble | Acceleration | A momentary pause at the beginning of acceleration or during acceleration. |
| Surges | Acceleration/cruise | A momentary minor irregularity in engine output. |
| 12 | Lack/loss of power | Acceleration/cruise | The performance is poor under load (such as power down when climbing hills). | See NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZI-3.7] . |
| 13 | Knocking/pinging | Acceleration/cruise | Sound is produced when the air/fuel mixture is ignited by something other than the spark plug (such as hot spot in combustion chamber). | See NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.7] . |
| 14 | Poor fuel economy | The fuel economy is unsatisfactory. | See NO. 14 POOR FUEL ECONOMY [MZI-3.7] . |
| 15 | Emission compliance | Fails emissions test. | See NO. 15 EMISSION COMPLIANCE [MZI-3.7] . |
| 16 | High oil consumption/leakage | The oil consumption is excessive. | See NO. 16 HIGH OIL CONSUMPTION/LEAKAGE [MZI-3.7] . |
| 17 | Cooling system concerns | Overheating | The engine runs at higher than normal temperature/overheats. | See NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7] . |
| 18 | Cooling system concerns | Runs cold | The engine does not reach normal operating temperature. | See NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI-3.7] . |
| 19 | Exhaust smoke | Blue, black, or white smoke from exhaust system | See NO. 19 EXHAUST SMOKE [MZI-3.7] . |
| 20 | Fuel odor (in engine compartment) | Gasoline fuel smell or visible leakage | See NO. 20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI-3.7] . |
| 21 | Engine noise | Engine noise from under hood | See NO. 21 ENGINE NOISE [MZI-3.7] . |
| 22 | Vibration concerns (engine) | Vibration from under hood or driveline | See NO. 22 VIBRATION CONCERNS (ENGINE) [MZI-3.7] . |
| 23 | A/C does not work sufficiently. | The A/C compressor magnetic clutch does not engage when A/C is turned on. | See NO. 23 A/C DOES NOT WORK SUFFICIENTLY [MZI-3.7] . |
| 24 | A/C is always on or A/C compressor runs continuously. | The A/C compressor magnetic clutch does not disengage. | See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7] . |
| 25 | A/C does not cut off under wide open throttle conditions. | The A/C compressor magnetic clutch does not disengage under wide open throttle. | See NO. 25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [MZI-3.7] . |
| 26 | Exhaust sulphur smell | Rotten egg smell (sulphur) from exhaust | See NO. 26 EXHAUST SULPHUR SMELL [MZI-3.7] . |
| 27 | Fuel refill concerns | The fuel tank does not fill smoothly. | See NO. 27 FUEL REFILL CONCERNS [MZI-3.7] . |
| 28 | Fuel filling shut off concerns | The fuel does not shut off properly. | See NO. 28 FUEL FILLING SHUT OFF CONCERNS [MZI-3.7] . |
| 29 | Spark plug condition | An incorrect spark plug condition. | See NO. 29 SPARK PLUG CONDITION [MZI-3.7] . |
| 30 | AT concerns | Upshift/downshift engagement | AT concerns not related to engine performance. | See SYMPTOM TROUBLESHOOTING ITEM TABLE [AW6A-EL, AW6AX-EL] . |
Scheme 5
Scheme 5: QUICK DIAGNOSTIC CHART [MZI-3.7]
Scheme 6
Scheme 7
Scheme 8
Diagnostic Procedure
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to appropriate the DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Inspect instrument cluster operation. See INSTRUMENT CLUSTER INSPECTION . |
| 2 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM INSPECTION [MZI-3.7] . |
NO. 2 MIL ILLUMINATES (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | NOTE: The following test should be performed on the advanced keyless entry system. If not equipped, go to the next step. Start the engine using the mechanical ignition key.Does the engine start? | Yes | Inspect advanced keyless entry system and repair or replace according to inspection result. See SYMPTOM TROUBLESHOOTING CHART [KEYLESS ENTRY SYSTEM] . |
| No | Go to the next step. |
| 2 | Connect the M-MDS to the DLC-2. Do the following conditions appear? The engine is not completely started. DTC P1260 is displayed. | Yes | Both conditions appear: Go to Step 4. |
| No | Either or other condition appears: Go to the next step. |
| 3 | Is the coil antenna connector securely connected to the coil antenna? | Yes | Go to the next step. |
| No | Connect the coil antenna connector securely. Return to Step 1. |
| 4 | Does the security light flush? | Yes | Go to the next step. |
| No | Inspect and repair or replace the following: Wiring harnesses and connectors from keyless control module terminal 3W and instrument cluster terminal 1W Wiring harness and connectors from keyless control module terminal 3X and instrument cluster terminal 1X Instrument cluster See INSTRUMENT CLUSTER INSPECTION . |
| 5 | Connect the M-MDS to the DLC-2 and retrieve DTC for PCM, instrument cluster and keyless control module. DTC PCM: B1342, U0073, U0155 Instrument cluster: B1213, B1600, B1601, B1602, B1681, B2103, B2139, B2431, U0100, U0214 Keyless control module (with advanced keyless entry system): B1681, B2103, B1213 | Yes | Go to appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | Go to the next step. |
| 6 | Inspect for the following wiring harnesses and connectors: With advanced keyless entry system Between coil terminal A and keyless control module terminal 3V Between coil terminal B and keyless control module terminal 3U Without advanced keyless entry system Between coil terminal A and instrument cluster terminal 1E Between coil terminal B and instrument cluster terminal 1G Is there any malfunction? | Yes | Repair or replace suspected wiring harness and connector. |
| No | Go to the next step, (with advanced keyless entry system) Go to the Step 8. (without advanced keyless entry system) |
| 7 | Inspect the following wiring harnesses and connectors for an open or short circuit: Between keyless control module terminal 3W and instrument cluster terminal 1W Between keyless control module terminal 3X and instrument cluster terminal 1X Is there any malfunction? | Yes | Repair or replace wiring harness and connectors. |
| No | Go to the next step. |
| 8 | Inspect for the following wiring harnesses and connectors: Between PCM terminal 1BG and instrument cluster terminal 1W Between PCM terminal 1BL and instrument cluster terminal 1X Is there any malfunction? | Yes | Repair or replace suspected wiring harness and connector. |
| No | Go to the next step. |
| 9 | Inspect the following: Battery connection Battery condition See BATTERY INSPECTION [MZI-3.7] . Fuses See NO. 1 MELTING OF MAIN OR OTHER FUSES (MZI-3.7) . Transmission in Park or Neutral (AT) Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 9. |
| 10 | Connect the M-MDS to the DLC-2. Turn ignition switch to the ON position. (Engine off) Access TR PID. Is TR PID indicated P/N when selecting P or N position | Yes | Go to the next step. |
| No | Inspect TR switch is adjusted properly, inspect for open or short circuit between TR switch and TCM. Repair or replace components as required. Then go to the next step. |
| 11 | Is clicking sound heard from starter relay when the ignition switch is turned to START? | Yes | Go to step 14. |
| No | Go to the next step. |
| 12 | Inspect the starter relay and following harnesses. Between starter relay and PCM Between starter relay and ignition switch See RELAY INSPECTION . Are they normal? | Yes | Go to the next step. |
| No | Repair or replace components as required. Then go to step 11. |
| 13 | Inspect IGNITION switch and related harnesses. See IGNITION SWITCH INSPECTION . Are they normal? | Yes | Go to the next step. |
| No | Repair or replace components as required. Then go to step 11. |
| 14 | Inspect the following harnesses. Between starter relay and Battery Between starter relay and Starter Are they normal? | Yes | Go to the next step. |
| No | Repair or replace as required. Then go to next step. |
| 15 | Inspect the starting system. See STARTER INSPECTION [MZI-3.7] . Is starting system normal? | Yes | Go to the next step. |
| No | Repair or replace components as required. |
| 16 | Inspect for seized/hydro locked engine or flywheel. Is ENGINE seized or hydro locked? | Yes | Repair or replace components as required. |
| No | Go to the next step. |
| 17 | Connect the M-MDS to the DLC-2. Retrieve any continuous memory DTCs. Are there any continuous memory DTCs displayed? | Yes | DTC is displayed: Go to appropriate DTC inspection. See DTC TABLE [MZI-3.7] . Communication error message is displayed: Inspect for the following: Open circuit in wiring harness between main relay and PCM terminal 1BO or 1BJ Open circuit in wiring harness between main relay terminal E and PCM terminal 1BM Main relay is stuck open. Open or short circuit in wiring harness between the DLC-2 and PCM terminals 1BL or 1BG Open or poor GND circuit (PCM terminal 1D, 1J, 1BP, 1BK) Poor connection of vehicle body GND |
| No | No DTC is displayed: Go to the next step. |
| 18 | Retrieve any KOEO DTCs using M-MDS. Are there DTCs displayed during KOEO inspection? | Yes | DTC is displayed: Go to appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 19 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
| NOTE |
|---|
| The following test should be performed on the advanced keyless entry system. If not equipped, go to the next step. |
NO. 3 WILL NOT CRANK (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Inspect for the following: Vacuum leakage Proper fuel quality (such as proper octane, contamination, winter/summer blend) Loose bands on intake-air system Cracks on intake-air system parts Intake-air system restriction (such as air cleaner element, fresh air duct. Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 1. |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 3 | Is engine overheating? | Yes | Go to symptom troubleshooting "No. 17 Cooling system concerns-Overheating". See NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7] . |
| No | Go to the next step. |
| 4 | Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders. Are wiring harness conditions normal? | Yes | Go to the next step. |
| No | Repair the wiring harnesses. |
| 5 | Inspect the spark plug conditions. Is spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: Inspect for fuel leakage from fuel injector. Spark plug is grayish white: Inspect the fuel injector for clogging. |
| No | Install the spark plugs on original cylinders. Go to the next step. |
| 6 | Visually inspect the CKP sensor and teeth of crankshaft pulley. Are the CKP sensor and teeth of crankshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 7 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 8 | Attempt to start engine at part throttle. Does engine run smoothly at part throttle? | Yes | Inspect the electronic throttle control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . |
| No | Go to the next step. |
| 9 | Install the fuel pressure gauge between the fuel pipe and fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position. Is fuel line pressure correct with ignition switch ON? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Zero or low: Inspect the fuel pump relay and the fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 10 | Is the fuel line pressure held after ignition switch is turned off? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Inspect the fuel injector. See FUEL INJECTOR INSPECTION [MZI-3.7] . If the fuel injector is normal, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 11 | Disconnect a vacuum hose from purge solenoid valve and plug opening end of vacuum hose. Start engine. Is starting condition improved? | Yes | Inspect if the purge solenoid valve is stuck open. |
| No | Go to the next step. |
| 12 | Inspect the MAF sensor for following: Contamination MAF sensor terminal B voltage (GND circuit) Is there any contamination? | Yes | Repair or replace the malfunctioning part. |
| No | Go to the next step. |
| 13 | Visually inspect the exhaust system part. Is there any deformed exhaust system part? | Yes | Replace the suspected part. |
| No | Go to the next step. |
| 14 | Inspect the starting system. See STARTER INSPECTION [MZI-3.7] . Is starting system normal? | Yes | Inspect for loose connectors or poor terminal contact. |
| No | Repair or replace components as required. |
| 15 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, Replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Do the following conditions appear? The engine is not completely started. DTC P1260 is displayed. | Yes | Both conditions appear: Go to Step 3. |
| No | Either or other condition appears: Go to the next step. |
| 2 | Does the engine stall after approx. 2 s since the engine is started? | Yes | Go to the next step. |
| No | Immobilizer system is normal. Go to Step 9. |
| 3 | Is coil connector securely connected to coil? | Yes | Go to the next step. |
| No | Connect the coil connector securely. Return to Step 2. |
| 4 | Does the security light flush? | Yes | Go to the next step. |
| No | Inspect and repair or replace the following: Wiring harnesses and connectors from keyless control module terminal 3W and instrument cluster terminal 1W Wiring harness and connectors from keyless control module terminal 3X and instrument cluster terminal 1X Instrument cluster See INSTRUMENT CLUSTER INSPECTION . |
| 5 | Connect the M-MDS to the DLC-2 and retrieve DTC for PCM, instrument cluster and keyless control module (with advanced keyless entry system). Are any of the following DTCs displayed? DTC PCM: B1342, U0073, U0155 Instrument cluster: B1213, B1600, B1601, B1602, B1681, B2103, 2139, B2431, U0110, U0214 Keyless control module (with advanced keyless entry system): B1681, B2103, B1213 | Yes | Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | Go to the next step. |
| 6 | Inspect for the following wiring harnesses and connectors: With advanced keyless entry system: Between coil terminal A and keyless control module terminal 3V Between coil terminal B and keyless control module terminal 3U Without advanced keyless entry system: Between coil terminal A and instrument cluster terminal 1G Between coil terminal B and instrument cluster terminal 1E Is there any malfunction? | Yes | Repair or replace the suspected wiring harness and connector. |
| No | Go to the next step, (with advanced keyless entry system. Go to Step 8. (without advanced keyless entry system. |
| 7 | Inspect the following wiring harnesses and connectors for an open or short circuit: Between keyless control module terminal 3W and instrument cluster terminal 1W Between keyless control module terminal 3X and instrument cluster terminal 1X Is there any malfunction? | Yes | Repair or replace wiring harness and connectors. |
| No | Go to the next step. |
| 8 | Inspect for the following wiring harnesses and connectors: Between PCM terminal 1BG and instrument cluster terminal 1W Between PCM terminal 1BL and instrument cluster terminal 1X Is there any malfunction? | Yes | Repair or replace the suspected wiring harness and connector. |
| No | Go to the next step. |
| 9 | Verify the following: Vacuum connection Air cleaner element No air leakage from intake-air system No restriction of intake-air system Proper sealing of intake manifold and components attached to intake manifold Ignition wiring Fuel quality: proper octane, contamination, winter/summer blend Electrical connections Smooth operation of throttle valve Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 9. |
| 10 | Connect the M-MDS to the DLC-2. Access the APP1 and APP2, APP3 PIDs. Crank the engine with accelerator pedal released. Are the APP1 and APP2, APP3 PIDs indicating that the accelerator pedal is in the released position? | Yes | Go to the next step. |
| No | Inspect for the following: APP sensor Wiring harnesses and connectors for following: PCM terminal 1AC-APP sensor terminal B PCM terminal 1 AH-APP sensor terminal C PCM terminal 1Y-APP sensor terminal D PCM terminal 1AK-APP sensor terminal E PCM terminal 1BA-APP sensor terminal F PCM terminal 1 AD-APP sensor terminal G PCM terminal 1AG-APP sensor terminal H |
| 11 | Connect the M-MDS to the DLC-2. Access the TP1, TP2 PID. Crank the engine with accelerator pedal released. Are the TP1, TP2 PID indicates the closed throttle position? | Yes | Go to the next step. |
| No | Inspect for the following: TP sensor Wiring harnesses and connectors for following: PCM terminal 2BO-TP sensor terminal A PCM terminal 2BR-TP sensor terminal B PCM terminal 2AD-TP sensor terminal C PCM terminal 2D-TP sensor terminal D PCM terminal 2AH-TP sensor terminal E PCM terminal 2Z-TP sensor terminal F |
| 12 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to appropriate DTC inspection. See DTC TABLE [MZI-3.7] . Communication error message is displayed: Inspect for the following: Open circuit in wiring harness between main relay and PCM terminal 1 BO or 1BJ Open main relay GND circuit Main relay is stuck open. Open or short circuit in wiring harness between the DLC-2 and PCM terminals 1BL or 1BG Open or poor GND circuit (PCM terminal 1D, 1J, 1BP, 1BK) Poor connection of vehicle body GND |
| No | No DTC is displayed: Go to the next step. |
| 13 | Attempt to start engine at part throttle. Does engine run smoothly at part throttle? | Yes | Inspect electronic throttle control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . |
| No | Go to the next step. |
| 14 | Connect the M-MDS to the DLC-2. Access RPM PID. Is RPM PID indicating engine speed during engine cranking? | Yes | Go to the next step. |
| No | Inspect for the following: Open or short circuit in CKP sensor Open or short circuit in wiring harness between CKP sensor terminal A and PCM terminal 2P Open or short circuit in wiring harness between CKP sensor terminal B and PCM terminal 2T Open or short circuit in CKP sensor wiring harnesses If CKP sensor and wiring harness are normal, go to the next step. |
| 15 | Visually inspect CKP sensor and teeth of crankshaft pulley. Are CKP sensor and teeth of crankshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 16 | Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders. Are wiring harness conditions normal? | Yes | Go to the next step. |
| No | Repair the wiring harnesses. |
| 17 | Perform the spark test. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Is strong blue spark visible at each cylinder? | Yes | Go to the next step. If symptoms occurs with the A/C on, go to Step 23. |
| No | Repair or replace the malfunctioning part according to spark test result. |
| 18 | Inspect the spark plug condition. Is spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: Inspect for fuel leakage from injector. Spark plug is grayish white: Inspect the fuel injector for clogging. |
| No | Install spark plugs on original cylinders. Go to the next step. |
| 19 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 20 | Visually inspect the exhaust system part. Is there any deformed exhaust system part? | Yes | Replace the suspected part. |
| No | Go to the next step. |
| 21 | Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position. Is fuel line pressure correct with ignition switch ON? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Zero or low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 22 | Visually inspect for fuel leakage at fuel injector O-ring and fuel line. Service if necessary. Is fuel line pressure held after ignition switch is turned off? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Inspect the fuel injector. If the fuel injector is normal, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 23 | NOTE: The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step. Connect pressure gauges to A/C low and high pressure side lines.Turn A/C on and measure low side and high side pressures.Are pressures within specifications?See REFRIGERANT PRESSURE CHECK . | Yes | Go to the next step. |
| No | If A/C is always on, go to symptom troubleshooting "No. 24 A/C is always on or A/C compressor runs continuously". See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7] . For other symptoms, inspect the following: Refrigerant charging amount Condenser fan operation |
| 24 | Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid side. Plug opening end of vacuum hose. Start the engine. Is the engine stall now eliminated? | Yes | Inspect if purge solenoid valve is stuck open. Inspect evaporative emission control system. |
| No | Go to the next step. |
| 25 | Is air leakage felt or heard at intake-air system components while racing the engine to higher speed? | Yes | Repair or replace the malfunctioning part. |
| No | Go to the next step. |
| 26 | Inspect variable valve timing control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does variable valve timing control function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning parts according to variable valve timing control system operation inspection results. |
| 27 | Is the engine compression correct? | Yes | Inspect the valve timing. |
| No | Inspect for cause. |
| 28 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
| NOTE |
|---|
| The following test is for stall concerns with the A/C on. If other symptoms exist, go to the next step. |
NO. 5 ENGINE STALLS-AFTER START/AT IDLE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Do any of the following conditions appear? Engine does not completely start. DTC P1260 is displayed. | Yes | Both conditions appear: Go to Step 3. |
| No | Either or other condition appears: Go to the next step. |
| 2 | Does engine stall after approx. 2 s from when it is started? | Yes | Go to the next step. |
| No | Immobilizer system is normal. Go to Step 9. |
| 3 | Is the coil connector securely connected to the coil? | Yes | Go to the next step. |
| No | Connect the coil connector securely. Return to Step 2. |
| 4 | Does the security light flush? | Yes | Go to the next step. |
| No | Inspect and repair or replace the following: Wiring harnesses and connectors from keyless control module terminal 3W and instrument cluster terminal 1W Wiring harness and connectors from keyless control module terminal 3X and instrument cluster terminal 1X Instrument cluster See INSTRUMENT CLUSTER INSPECTION . |
| 5 | Connect the M-MDS to the DLC-2 and retrieve the DTC for PCM, instrument cluster and keyless control module (with advanced keyless entry system). Are any of the following DTCs displayed? DTC PCM: B1342, U0073, U0155 Instrument cluster: B1213, B1600, B1601, B1602, B1681, B2103, B2139, B2431, U0100, U0214 Keyless control module (with advanced keyless entry system): B1681, B2103, B1213 | Yes | Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | Go to the next step. |
| 6 | Inspect the following wiring harnesses and connectors: With advanced keyless entry system: Between coil terminal A and keyless control module terminal 3V Between coil terminal B and keyless control module terminal 3U Without advanced keyless entry system: Between coil terminal A and instrument cluster terminal 1G Between coil terminal B and instrument cluster terminal 1E Is there any malfunction? | Yes | Repair or replace the suspected wiring harness and connector. |
| No | Go to the next step, (with advanced keyless entry system. Go to Step 8. (without advanced keyless entry system. |
| 7 | Inspect the following wiring harnesses and connectors for an open or short circuit: Between keyless control module terminal 3W and instrument cluster terminal 1W Between keyless control module terminal 3X and instrument cluster terminal 1X Is there any malfunction? | Yes | Repair or replace wiring harness and connectors. |
| No | Go to the next step. |
| 8 | Inspect the following wiring harnesses and connectors: Between PCM terminal 1BG and instrument cluster terminal 1W Between PCM terminal 1BL and instrument cluster terminal 1X Is there any malfunction? | Yes | Repair or replace the suspected wiring harness and connector. |
| No | Go to the next step. |
| 9 | Verify the following: Vacuum connection External fuel shut off or accessory (such as kill switch, alarm) Fuel quality: proper octane, contamination, winter/summer blend No air leakage from intake-air system Intake-air system restriction (such as air cleaner element, fresh air duct) Proper sealing of intake manifold and components attached to intake manifold Ignition wiring Electrical connections Fuses Smooth operation of throttle valve Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 9. |
| 10 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . Communication error message is displayed: Inspect for the following: Open circuit in wiring harness between main relay and PCM terminal 1 BO or 1BJ Open main relay GND circuit Open or short circuit in wiring harness between the DLC-2 and PCM terminal 1BL or 1BG Main relay is stuck open. Open or poor GND circuit (PCM terminal 1D, 1J, 1BP, 1BK) Poor connection of vehicle body GND |
| No | No DTC is displayed: Go to the next step. |
| 11 | Connect the M-MDS to the DLC-2. Access the APP1 and APP2, APP3 PIDs. Crank the engine with accelerator pedal released. Are the APP1 and APP2, APP3 PIDs indicating that the accelerator pedal is in the released position? | Yes | Go to the next step. |
| No | Inspect for the following: APP sensor Wiring harnesses and connectors for following: PCM terminal 1 AC-APP sensor terminal B PCM terminal 1 AH-APP sensor terminal C PCM terminal 1Y-APP sensor terminal D PCM terminal 1AK-APP sensor terminal E PCM terminal 1BA-APP sensor terminal F PCM terminal 1AD-APP sensor terminal G PCM terminal 1AG-APP sensor terminal H |
| 12 | Connect the M-MDS to the DLC-2. Access the TP1, TP2 PID. Crank the engine with accelerator pedal released. Are the TP1, TP2 PID indicates the closed throttle position? | Yes | Go to the next step. |
| No | Inspect for the following: TP sensor Wiring harnesses and connectors for following: PCM terminal 2BO-TP sensor terminal A PCM terminal 2BR-TP sensor terminal B PCM terminal 2AD-TP sensor terminal C PCM terminal 2D-TP sensor terminal D PCM terminal 2AH-TP sensor terminal E PCM terminal 2Z-TP sensor terminal F |
| 13 | Does the engine start with the throttle valve closed? | Yes | Go to Step 28. |
| No | Go to the next step. |
| 14 | Will the engine start and run smoothly at part throttle? | Yes | Inspect the electronic throttle control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . |
| No | Go to the next step. |
| 15 | Connect the M-MDS to the DLC-2. Access RPM PID. Is RPM PID indicating the engine speed when cranking the engine? | Yes | Go to the next step. |
| No | Inspect for the following: Open or short circuit in CKP sensor Open or short circuit in wiring harness between CKP sensor terminal A and PCM terminal 2P Open or short circuit in wiring harness between CKP sensor terminal B and PCM terminal 2T Open or short circuit in CKP sensor wiring harnesses If CKP sensor and wiring harness are normal, go to the next step. |
| 16 | Visually inspect the CKP sensor and teeth of crankshaft pulley. Are CKP sensor and teeth of crankshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 17 | Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders. Are wiring harness conditions normal? | Yes | Go to the next step. |
| No | Repair the wiring harnesses. |
| 18 | Perform the spark test. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Is strong blue spark visible at each cylinder? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to spark test result. |
| 19 | Inspect the spark plug conditions. Is spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: Inspect for fuel leakage from injector. Spark plug is grayish white: Inspect the fuel injector for clogging. |
| No | Install the spark plugs on original cylinders. Go to the next step. |
| 20 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 21 | Visually inspect the exhaust system part. Is there any deformed exhaust system part? | Yes | Replace the suspected part. |
| No | Go to the next step. |
| 22 | Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position. Is fuel line pressure correct when ignition switch is turned on/off five times? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Zero or low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 23 | Visually inspect the fuel injector O-ring and fuel line for fuel leakage. Service if necessary. Is the fuel line pressure held after the ignition switch is turned off? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Inspect the fuel injector. If the fuel injector is normal, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 24 | Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side. Plug opening end of vacuum hose. Start the engine. Is starting condition improved? | Yes | Inspect if the purge solenoid valve is stuck open mechanically. Inspect the evaporative emission control system. |
| No | Go to the next step. |
| 25 | Is air leakage felt or heard at intake-air system components while racing engine to higher speed? | Yes | Repair or replace the malfunctioning part. |
| No | Go to the next step. |
| 26 | Inspect the variable valve timing control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does variable valve timing control function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 27 | Is the engine compression correct? | Yes | Inspect the valve timing. |
| No | Inspect for causes. |
| 28 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 6 CRANKS NORMALLY BUT WILL NOT START (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 2 | Remove thermostat and inspect operation. See THERMOSTAT REMOVAL/INSTALLATION [MZI-3.7] . See THERMOSTAT INSPECTION [MZI-3.7] . Is thermostat normal? | Yes | ECT and thermostat are normal. Go to the next step. |
| No | Access ECT PID on the M-MDS. Inspect for both ECT PID and temperature gauge on instrument cluster readings. If temperature gauge on instrument cluster indicates normal range but ECT PID is not same as temperature gauge reading, inspect CHT sensor. If temperature gauge on instrument cluster indicates cold range but ECT PID is normal, inspect temperature gauge and heat gauge unit. |
| 3 | Is throttle body free of contamination? | Yes | Inspect for air leakage from the intake-air system components while racing the engine to higher speed. |
| No | Clean or replace throttle body. |
| 4 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 7 SLOW RETURN TO IDLE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Warm up the engine. Idle the engine for 5 min. Is the symptom disappeared? | Yes | Troubleshooting completed. (Cause of this symptom is that the idle learning of electronic throttle control system is not completed. |
| No | Go to the next step. |
| 2 | Verify the following: External fuel shut off or accessory (such as kill switch, alarm) Fuel quality (such as proper octane, contamination, winter/summer blend) No air leakage from intake-air system Proper sealing of intake manifold and components attached to intake manifold Ignition wiring Electrical connections Fuses Smooth operation of throttle valve PCM GND circuit (1D, U, 1BP, 1BK) Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 2. |
| 3 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 4 | Is the engine overheating? | Yes | Go to symptom troubleshooting "No. 17 Cooling system concerns - Overheating". See NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7] . |
| No | Go to the next step. |
| 5 | Connect the M-MDS to the DLC-2. Access MAF PID. Drive vehicle with monitoring PID. Is MAF PID within specification? | Yes | Go to the next step. |
| No | Inspect for open or short circuit of MAF sensor and related wiring harness. |
| 6 | NOTE: The following test is for engine running at rough idle with A/C on. If other symptoms exist, go to the next step. Connect pressure gauge to A/C low and high pressure side lines.Start engine and idle it.Turn the A/C switch on.Measure low side and high side pressures.Are pressures within specifications?See REFRIGERANT PRESSURE CHECK . | Yes | Go to the next step. |
| No | If the A/C is always on, go to symptom troubleshooting "No. 24 A/C is always on or A/C compressor runs continuously". See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7] . For other symptoms, inspect the following: Refrigerant charging amount Condenser fan operation |
| 7 | NOTE: The following test is for engine running rough with P/S on. If other symptoms exist, go to the next step. Connect the M-MDS to the DLC-2.Start the engine and idle it.Access PSP PID.Is PSP PID within specification? | Yes | Go to the next step. |
| No | Inspect power steering pressure switch operation and wiring harness between P/S pressure switch and PCM terminal 21. |
| 8 | Visually inspect the CKP sensor and teeth of crankshaft pulley. Are the CKP sensor and teeth of crankshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 9 | Inspect the ignition coil related wiring harness condition (intermittent open or short circuit) for all cylinders. Are wiring harness conditions normal? | Yes | Go to the next step. |
| No | Repair the wiring harnesses. |
| 10 | Inspect the spark plug condition. Is the spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: Inspect for fuel leakage from injector. Spark plug is grayish white: Inspect the fuel injector for clogging. |
| No | Install the spark plugs on original cylinders. Go to the next step. |
| 11 | Perform the electronic throttle control system operation inspection. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the electronic throttle control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to electronic throttle control system operation inspection results. |
| 12 | Install fuel pressure gauge between fuel pipe and fuel distributor. Start the engine and run it at idle. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Low: Inspect the fuel line for clogging. If there is no malfunction, replace fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 13 | Visually inspect for fuel leakage at fuel injector, O-ring, and fuel line. Service if necessary. Does fuel line pressure hold after ignition switch is turned off? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Inspect fuel injector. If fuel injector is normal, replace fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 14 | Connect the M-MDS to the DLC-2. Start the engine and idle it. Access LONG FT1 PID, LONG FT2 PID. Measure LONG FT1 PID, LONG FT2 PID at idle. Is PID value normal? | Yes | Go to the next step. |
| No | LONG FT1 PID, LONG FT2 PID is out of specification. Less than specification (too rich): Inspect EVAP control system. Greater than specification (too lean): Inspect for air leakage at intake-air system components. If system is normal, go to the next step. |
| 15 | Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side. Plug opening end of vacuum hose. Start the engine. Does the engine condition improve? | Yes | Check if purge solenoid valve is stuck open mechanically. Inspect EVAP control system. |
| No | Go to the next step. |
| 16 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 17 | Visually inspect the exhaust system part. Is there any deformed exhaust system part? | Yes | Replace the suspected part. |
| No | Go to the next step. |
| 18 | Visually inspect the CMP sensor and teeth of camshaft. Are the CMP sensor and teeth of camshaft normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 19 | Inspect variable valve timing control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does variable valve timing control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 20 | Is engine compression correct? | Yes | Inspect the valve timing. |
| No | Inspect for causes. |
| 21 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
| NOTE |
|---|
| The following test is for engine running at rough idle with A/C on. If other symptoms exist, go to the next step. |
| NOTE |
|---|
| The following test is for engine running rough with P/S on. If other symptoms exist, go to the next step. |
NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Access ECT PID. Start and warm up engine to normal operating temperature. Is ECT PID between 82-112°C {180-234°F}? | Yes | Go to the next step. |
| No | ECT PID is higher than 112°C {234°F}: Go to symptom troubleshooting "No. 17 Cooling system concerns - Overheating". ECT PID is less than 82°C {180°F}: Go to symptom troubleshooting "No. 18 Cooling system concerns - Runs cold". |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 3 | Access and monitor PSP and TR PIDs. Are PIDs values normal? See PCM INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | If the AC_REQ PID is not normal: Inspect A/C switch, refrigerant pressure switch, and fan switch, and related wiring harness for vibration or intermittent open/short circuit. If the TR PID is not normal: Inspect TR switch and related wiring harness for vibration or intermittent open/short circuit. If the PSP PID is not normal: Inspect power steering switch and related wiring harness for vibration or intermittent open/short circuit. |
| 4 | Is there air leakage felt or heard at intake-air system components while racing engine to higher speed? | Yes | Repair or replace parts if necessary. |
| No | Inspect the following: Electronic throttle control system operation Accelerator pedal position sensor |
| 5 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 9 FAST IDLE/RUNS ON (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Does the engine idle roughly? | Yes | Go to symptom troubleshooting "No. 8 Engine runs rough/rolling idle". See NO. 8 ENGINE RUNS ROUGH/ROLLING IDLE [MZI-3.7] . |
| No | Go to the next step. |
| 2 | Turn off the A/C switch and fan switch. Does the A/C magnetic clutch engage? | Yes | Go to symptom troubleshooting "No. 24 A/C is always on or A/C compressor runs continuously." See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7] . |
| No | Go to the next step. |
| 3 | Verify the following: Proper routing of and no damage to vacuum lines No air leakage from intake-air system Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 3. |
| 4 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 5 | Perform the electronic throttle control system operation inspection. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the electronic throttle control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to electronic throttle control system operation inspection results. |
| 6 | Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side. Plug opening end of vacuum hose. Drive the vehicle. Does the engine condition improve? | Yes | Inspect the evaporative emission control system. |
| No | Go to the next step. |
| 7 | Connect the M-MDS to the DLC-2. Access APP1, APP2, APP3, TP1, TP2, MAF and VSS PIDs. Monitor each PID while driving vehicle. See PCM INSPECTION [MZI-3.7] . Are PIDs normal? | Yes | Go to the next step. |
| No | APP1, APP2, APP3 PIDs: Inspect the accelerator pedal position sensor. TP1, TP2 PID: Inspect TP sensor. MAF PID: Inspect MAF sensor. VSS PID: Inspect VSS. |
| 8 | Access and monitor BOO, TR PIDs. Are PIDs values normal? See PCM INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | If the BOO PID is not normal: Inspect brake switch, and related wiring harness for vibration or intermittent open/short circuit. If the TR PID is not normal: Inspect TR switch and related wiring harness for vibration or intermittent open/short circuit. |
| 9 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 10 LOW IDLE/STALLS DURING DECELERATION (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Verify the following: Vacuum connection Air cleaner element No air leakage from intake-air system No restriction of intake-air system Proper sealing of intake manifold and components attached to intake manifold Ignition wiring Fuel quality (such as proper octane, contamination, winter/summer blend) Electrical connections Smooth operation of throttle valve Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 1. |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 3 | Is engine overheating? | Yes | Go to symptom troubleshooting "No. 17 Cooling system concerns - Overheating". |
| No | Go to the next step. |
| 4 | Connect the M-MDS to the DLC-2. Access APP1, APP2, APP3, RPM, VPWR, MAF, TP1, TP2 and VSS PIDs. Drive the vehicle with monitoring PIDs. Are PIDs within specifications? See PCM INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | APP1, APP2, APP3 PIDs: Inspect if output signal from APP sensor changes smoothly. RPM PID: Inspect the CKP sensor and related wiring harness for vibration or intermittent open/short circuit. VPWR PID: Inspect for open circuit intermittently. MAF PID: Inspect for open circuit of the MAF sensor and related wiring harness intermittently. TP1, TP2 PID: Inspect if output signal from TP sensor changes smoothly. VSS PID: Inspect for open circuit of VSS and related wiring harness intermittently. |
| 5 | Visually inspect the CKP sensor and teeth of crankshaft pulley. Are CKP sensor and teeth of crankshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 6 | Inspect the spark plug conditions. Is spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: Inspect for fuel leakage from fuel injector. Spark plug is grayish white: Inspect the fuel injector for clogging. |
| No | Install the spark plugs on original cylinders. Go to the next step. |
| 7 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 8 | Perform the electronic throttle control system operation inspection. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the electronic throttle control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to electronic throttle system operation inspection results. |
| 9 | Visually inspect deformed exhaust system part. Is there any deformed exhaust system part? | Yes | Replace the suspected part. |
| No | Go to the next step. |
| 10 | Install fuel pressure gauge between the fuel pipe and fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position. Is fuel line pressure correct with ignition switch to ON position? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Zero or low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 11 | Visually inspect for fuel leakage at fuel injector O-ring and fuel line. Service if necessary. Is fuel line pressure held after ignition switch is turned off? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Inspect the fuel injector. If the fuel injector is normal, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 12 | NOTE: The following test is for engine stall with the A/C on. If other symptom exists, go to the next step. Connect a pressure gauge to A/C low and high pressure side lines.Turn the A/C on and measure low side and high side pressure.Are pressures within specifications?See REFRIGERANT PRESSURE CHECK . | Yes | Go to the next step. |
| No | If the A/C is always on, go to symptom troubleshooting "No. 24 A/C is always on or A/C compressor runs continuously". See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7] . For other symptoms, inspect the following: Refrigerant charging amount Condenser fan operation |
| 13 | NOTE: The following test should be performed for symptom with cruise control ON. If other symptoms exist, go to the next step. Inspect cruise control system.Is cruise control system normal? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 14 | Inspect the front HO2S. See FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZI-3.7] . Is the front HO2S normal? | Yes | Go to the next step. |
| No | Replace the front HO2S. See REAR HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZI-3.7] . |
| 15 | Inspect the evaporative purge hose between the fuel tank and the purge valve. Does fuel flow into evaporative purge hose? | Yes | Inspect the check valve (two-way). See FUEL TANK INSPECTION [MZI-3.7] . |
| No | Go to the next step. |
| 16 | Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side. Plug opening end of vacuum hose. Drive the vehicle. Does the engine condition improve? | Yes | Go to the next step. Inspect if the purge solenoid valve is stuck open mechanically. Inspect the evaporative emission control system. |
| No | Go to the next step. |
| 17 | Visually inspect the CMP sensor and projections of camshaft pulley. Are CMP sensor and projections of camshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 18 | Is the engine compression correct? | Yes | Inspect the following: Valve timing Internal transaxle part Engine mounts Check valve (two-way) |
| No | Inspect for cause. |
| 19 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
| NOTE |
|---|
| The following test is for engine stall with the A/C on. If other symptom exists, go to the next step. |
| NOTE |
|---|
| The following test should be performed for symptom with cruise control ON. If other symptoms exist, go to the next step. |
NO. 11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Verify the following: Vacuum connection Restriction in intake-air system (such as air cleaner element, fresh air duct) No air leakage from intake-air system No restriction of intake-air system Proper sealing of intake manifold and components attached to intake manifold Fuel quality (such as proper octane, contamination, winter/summer blend) Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 1. |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 3 | Is the engine overheating? | Yes | Go to symptom troubleshooting "No. 17 Cooling system concerns-Overheating". |
| No | Go to the next step. |
| 4 | Connect the M-MDS to the DLC-2. Access APP1, APP2, APP3, RPM, MAF, TP1, TP2, IAT and VSS PIDs. Drive vehicle while monitoring PIDs. Are PIDs within specifications? See PCM INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | APP1, APP2, APP3 PIDs: Inspect if output signal accelerator pedal position sensor changes smoothly. RPM PID: Inspect CKP sensor and related wiring harness for vibration or intermittent open/short circuit or both. MAF PID: Inspect for intermittent open circuit of MAF sensor and related wiring harness. TP1, TP2 PID: Inspect if output signal TP sensor changes smoothly. IAT PID: Inspect for air suction in intake-air system. If normal, inspect intermittent short circuit of IAT sensor and related wiring harnesses. VSS PID: Inspect for intermittent open circuit of VSS and related wiring harness. |
| 5 | Visually inspect the CKP sensor and teeth of crankshaft pulley. Are the CKP sensor and teeth of crankshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 6 | Inspect the spark plug condition. Is spark plug wet, covered with carbon or grayish white? | Yes | Spark plug is wet or covered with carbon: Inspect the fuel injector for fuel leakage. Inspect spark plug and high-tension lead. Spark plug is grayish white: Inspect the fuel injector for clogging. |
| No | Install the spark plugs on original cylinders. Go to the next step. |
| 7 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace PCV valve. |
| 8 | Perform electronic throttle control system operation inspection. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does electronic throttle control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to electronic throttle control system operation inspection results. |
| 9 | Visually inspect deformed exhaust system part. Is there any deformed exhaust system part? | Yes | Replace the suspected part. |
| No | Go to the next step. |
| 10 | Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position. Is fuel line pressure correct with ignition switch to ON position? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Zero or low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 11 | NOTE: The following test is for engine stalling with the A/C on concern. If other symptoms exist, go to the next step. Connect pressure gauge to the A/C low and high side pressure lines.Turn the A/C on and measure low side and high side pressures.Are pressures within specifications?See REFRIGERANT PRESSURE CHECK . | Yes | Go to the next step. |
| No | If A/C is always on, go to symptom troubleshooting "No. 24 A/C is always on or A/C compressor runs continuously". See NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7] . For other symptoms, inspect the following: Refrigerant charging amount Condenser fan operation |
| 12 | Inspect for A/C cut-off operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the A/C cut-off function properly? | Yes | Go to the next step. |
| No | Inspect A/C cut-off system components. |
| 13 | Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from purge solenoid valve side. Plug opening end of vacuum hose. Drive the vehicle. Does the engine condition improve? | Yes | Inspect if purge solenoid valve is stuck open mechanically. Inspect the evaporative emission control system. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . |
| No | Go to the next step. |
| 14 | Visually inspect the CMP sensor and projections of camshaft pulley. Are the CMP sensor and projections of camshaft pulley normal? | Yes | Go to the next step. |
| No | Replace the malfunctioning part. |
| 15 | Inspect the variable valve timing control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the variable valve timing control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to variable valve timing control system inspection results. |
| 16 | Is the engine compression correct? | Yes | Inspect the following: Valve timing Internal transaxle components Brake system for dragging |
| No | Inspect for cause. |
| 17 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
| NOTE |
|---|
| The following test is for engine stalling with the A/C on concern. If other symptoms exist, go to the next step. |
NO. 12 LACK/LOSS OF POWER-ACCELERATION/CRUISE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Access ECT PID. Verify ECT PID is less than 116°C {241°F} during driving. Is ECT PID less than specification? | Yes | Go to the next step. |
| No | Inspect the cooling system for cause of overheating. |
| 2 | Connect the M-MDS to the DLC-2. Access IAT and MAF PIDs. Monitor each PID. See PCM INSPECTION [MZI-3.7] . Are PIDs normal? | Yes | Go to the next step. |
| No | IAT PID: Inspect IAT sensor MAF PID: Inspect MAF sensor |
| 3 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (engine off). Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 4 | Is engine compression correct? | Yes | Go to the next step. |
| No | Inspect for cause. |
| 5 | Install fuel pressure gauge between fuel pipe and fuel distributor. Start the engine and idle it. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Inspect the ignition timing. |
| No | Low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 6 | Inspect the knock sensor. Is the knock sensor normal? | Yes | Inspect ignition timing. |
| No | Replace the knock sensor. |
| 7 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Inspect for the following: Air cleaner element for contamination ATF level Fuel quality Coolant level Brake dragging Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 1. |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 3 | Access ECT PID. Drive vehicle while monitoring PID. See PCM INSPECTION [MZI-3.7] . Is PID within specification? | Yes | Go to the next step. |
| No | Inspect for coolant leakage, cooling fan and condenser fan operations or thermostat operation. |
| 4 | Perform the spark test. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Is strong blue spark visible at each cylinder? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to spark test result. |
| 5 | Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Start the engine and idle it. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 6 | Inspect for variable valve timing control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the variable valve timing control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 7 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 8 | Visually inspect the exhaust system part. Is there any deformed exhaust system? | Yes | Replace the suspected part. |
| No | Go to the next step. |
| 9 | Inspect for contaminated MAF sensor. Is there any contamination? | Yes | Go to the next step. |
| No | Inspect for cause. |
| 10 | Inspect the MAF sensor for contamination. Is there any contamination? | Yes | Replace MAF sensor. |
| No | Go to the next step. |
| 11 | Is engine compression correct? | Yes | Inspect the valve timing. |
| No | Inspect for cause. |
| 12 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 14 POOR FUEL ECONOMY (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Inspect for the following: Vacuum lines for leakage or blockage Electrical connections Proper maintenance schedule followed Intake-air system and air cleaner element concerns: obstructions, leakage or dirtiness Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 1. |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 3 | Is any other driveability concern present? | Yes | Go to appropriate symptom troubleshooting. |
| No | Go to the next step. |
| 4 | Connect the M-MDS to the DLC-2. Access ECT PID. Warm up the engine and idle it. Verify ECT PID is correct. See PCM INSPECTION [MZI-3.7] . Is ECT PID correct? | Yes | Go to the next step. |
| No | Inspect for coolant leakage, cooling fan and condenser fan operation or thermostat operation. |
| 5 | Inspect fuel-filler cap. See FUEL-FILLER CAP INSPECTION [MZI-3.7] . Is there any leakage at fuel-filler cap? | Yes | Replace the fuel-filler cap. |
| No | Go to the next step. |
| 6 | Inspect the front HO2S. See FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZI-3.7] . Is front HO2S normal? | Yes | Go to the next step. |
| No | Replace the front HO2S. See FRONT HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZI-3.7] . |
| 7 | Perform spark test. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Is strong blue spark visible at each cylinder? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part according to spark test result. |
| 8 | Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Start the engine and idle it. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Low: Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 9 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 10 | Inspect for fuel saturation inside charcoal canister. Is excess amount of liquid fuel present in canister? | Yes | Replace the charcoal canister. |
| No | Inspect the fuel tank vent system. Then, go to the next step. See FUEL TANK INSPECTION [MZI-3.7] . |
| 11 | Visually inspect the exhaust system part. Is there any deformed exhaust system part? | Yes | Replace the part. |
| No | Go to the next step. |
| 12 | Inspect the three-way catalytic converter. See EXHAUST SYSTEM INSPECTION [MZI-3.7] . Is the three-way catalytic converter normal? | Yes | Go to the next step. |
| No | Replace the three-way catalytic converter. |
| 13 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 15 EMISSION COMPLIANCE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step. |
| No | Replace the PCV valve. |
| 2 | Inspect for the following: External leakage Proper dipstick Proper engine oil viscosity Are all items normal? | Yes | Inspect the internal engine parts such as valves, valve guides, valve stem seals, cylinder head drain passage, and piston rings. |
| No | Service if necessary. Repeat Step 2. |
| 3 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 16 HIGH OIL CONSUMPTION/LEAKAGE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Inspect the following: Engine coolant level Coolant leakage Water and anti-freeze mixture Radiator condition Collapsed or restricted radiator hoses Radiator pressure cap Overflow system Fan rotational direction Fuses Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 1. |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 3 | Start the engine and idle it. Turn the A/C switch on and set blower fan to any speed. Does the A/C compressor engage? | Yes | Go to Step 5. |
| No | Inspect for the following and repair or replace if necessary: Refrigerant charging amount Open circuit in wiring harness between A/C relay and PCM terminal 1N Seized A/C magnetic clutch A/C magnetic clutch malfunction If all items are normal, go to the next step. |
| 4 | Connect the M-MDS to the DLC-2. Access AC_REQ PID. Start the engine and idle it. Turn the A/C switch and fan switch on. Does AC_REQ PID read on? | Yes | Go to the next step. |
| No | Inspect the following: Refrigerant pressure switch operation The A/C switch is stuck open. Open or short circuit between refrigerant pressure switch and PCM terminal 1R Open circuit of blower motor fan switch and resistor (if blower motor does not operate) The evaporator temperature sensor and A/C amplifier |
| 5 | Inspect cooling fan control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the cooling fan control system function properly? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 6 | Is the drive belt normal? | Yes | Go to the next step. |
| No | Replace the drive belt. |
| 7 | Is there leakage around the heater unit in passenger compartment? | Yes | Inspect and service heater for leakage. |
| No | Go to the next step. |
| 8 | Is there leakage at the coolant hoses and/or radiator? | Yes | Replace the malfunctioning part. |
| No | Go to the next step. |
| 9 | Cool down the engine. Remove thermostat and inspect operation. See THERMOSTAT REMOVAL/INSTALLATION [MZI-3.7] . See THERMOSTAT INSPECTION [MZI-3.7] . Is thermostat normal? | Yes | The engine coolant temperature and thermostat are normal, inspect engine block for leakage or blockage. |
| No | Access ECT PID. Inspect for both ECT PID and temperature gauge readings. If temperature gauge on instrument cluster indicates normal range but ECT PID is not same as temperature gauge reading, inspect CHT sensor. If temperature gauge on instrument cluster indicates overheating but ECT PID is normal, inspect temperature gauge and heat gauge unit. |
| 10 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Is customer complaint "Lack of passenger compartment heat" only? | Yes | Inspect A/C and heater system. |
| No | Go to the next step. |
| 2 | Does the engine speed continue at fast idle? | Yes | Go to symptom troubleshooting "No. 9 Fast idle/runs on". See NO. 9 FAST IDLE/RUNS ON [MZI-3.7] . |
| No | Go to the next step. |
| 3 | Remove the thermostat and inspect operation. See THERMOSTAT REMOVAL/INSTALLATION [MZI-3.7] . See THERMOSTAT INSPECTION [MZI-3.7] . Is thermostat normal? | Yes | Go to the next step. |
| No | Replace the thermostat. |
| 4 | Inspect cooling fan control system operation. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Does the cooling fan control system function properly? | Yes | Access ECT PID. Inspect for both ECT PID and temperature gauge on instrument cluster readings. If the temperature gauge on the instrument cluster indicates normal range but ECT PID is not the same as temperature gauge reading, inspect the CHT sensor. If the temperature gauge on the instrument cluster indicates cold range but ECT PID is normal, inspect the temperature gauge and heat gauge unit. |
| No | Repair or replace the malfunctioning part. |
| 5 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | What color is smoke coming from the exhaust system? | Blue | Burning oil is indicated. Go to the next step. |
| White | Water in combustion is indicated. Go to Step 3. |
| Black | Rich fuel mixture is indicated. Go to Step 4. |
| 2 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Inspect for the following: Damaged valve guide, stems or valve seals Blocked oil drain passage in cylinder head Piston ring is not seated, seized or worn. Damaged cylinder bore If other driveability symptoms are present, return to diagnostic index to service any additional symptoms. |
| No | Replace the PCV valve. |
| 3 | Does the cooling system hold pressure? | Yes | Inspect for the following: Cylinder head gasket leakage Intake manifold gasket leakage Cracked or porous engine block If other driveability symptoms are present, return to diagnostic index to service any additional symptoms. |
| No | Inspect for cause. |
| 4 | Inspect for the following: Air cleaner restriction Collapsed or restricted intake-air system Restricted fuel return line Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 4. |
| 5 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 6 | Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Start the engine and idle it. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Low: Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 7 | Perform the spark test. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Is strong blue spark visible at each cylinder? | Yes | Inspect the CMP sensor. See CAMSHAFT POSITION (CMP) SENSOR INSPECTION [MZI-3.7] . |
| No | Repair or replace the malfunctioning part according to spark test result. |
| 8 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 19 EXHAUST SMOKE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Visually inspect for fuel leakage at fuel injector O-ring and fuel line. Service if necessary. Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Start engine and idle it. Measure fuel line pressure during idle. Is fuel line pressure correct during idle? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 2 | Inspect for blockage/restriction or open circuit in wiring harness between the engine vacuum port and the charcoal canister. Inspect for blockage in fuel tank vent system. Is malfunction indicated? | Yes | Replace vacuum hose. |
| No | Go to the next step. |
| 3 | Inspect the purge solenoid valve. See PURGE SOLENOID VALVE INSPECTION [MZI-3.7] . Is the solenoid operating properly? | Yes | Go to the next step. |
| No | Replace the purge solenoid valve. See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [MZI-3.7] . |
| 4 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Inspect charcoal canister for fuel saturation. If excess amount of liquid fuel is present, replace the charcoal canister. |
| 5 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 20 FUEL ODOR (IN ENGINE COMPARTMENT) (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Is a squealing, click or chirping sound present? | Yes | Inspect for the followings: Engine oil level Drive belt tension Splash shield or under cover looseness Generator installation (alignment) |
| No | Go to the next step. |
| 2 | Is a rumbling or grinding noise present? | Yes | Inspect for the followings: Drive belt tension P/S fluid level |
| No | Go to the next step. |
| 3 | Is a rattling noise present? | Yes | Inspect rattling location for loose parts. |
| No | Go to the next step. |
| 4 | Is a hissing noise present? | Yes | Inspect for the following: Vacuum leakage Spark plug looseness Intake-air system leakage |
| No | Go to the next step. |
| 5 | Is a rapping or roar noise present? | Yes | Inspect looseness for followings: Dynamic dumper Intake-air system Exhaust system |
| No | Go to the next step. |
| 6 | Is a knocking noise present? | Yes | Go to symptom troubleshooting "No. 13 Knocking/pinging". See NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.7] . |
| No | If the noise comes from the engine internal, inspect for friction gear, timing chain or MLA noise. |
| 7 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 21 ENGINE NOISE (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Inspect the following components for loose attaching bolts or worn parts: Cooling fan Drive belt and pulleys Generator Engine mounts Exhaust system mounts All items normal? | Yes | Inspect the following systems: Wheels ATX Driveline Suspension |
| No | Readjust or retighten engine mount installation position. Service if necessary for other parts. |
| 2 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 22 VIBRATION CONCERNS (ENGINE) (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 2 | Disconnect A/C compressor connector. Start engine and turn A/C switch on. Is there correct voltage at A/C compressor magnetic clutch terminal? Specification 10.5 V or more | Yes | Inspect for GND condition of magnetic clutch on A/C compressor. If GND condition is normal, inspect for open circuit magnetic clutch coil. |
| No | Go to the next step. |
| 3 | Disconnect refrigerant pressure switch connector. Connect jumper wiring between A/C high pressure switch terminal. Connect jumper wiring between refrigerant pressure switch terminal. Turn the ignition switch to the ON position. Turn A/C switch on and set blower fan to any speed. Does A/C work? | Yes | Inspect refrigerant pressure switch operation. If switch is normal, go to the next step. |
| No | Inspect for the following: A/C switch is stuck open. Open circuit in wiring harness between refrigerant pressure switch and PCM terminal 1R Open circuit in wiring harness between blower motor fan switch and resistor (if blower motor does not operate) Evaporator temperature sensor and A/C amplifier |
| 4 | Remove jumper wiring from the switch connector. Reconnect connector to refrigerant pressure switch. Start the engine and turn the A/C switch on. Does the fan operate? | Yes | Inspect whether A/C relay is stuck open. Replace if necessary. |
| No | Inspect the following and repair or replace if necessary: Refrigerant charging amount A/C compressor for seizure |
| 5 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 23 A/C DOES NOT WORK SUFFICIENTLY (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 2 | Start the engine and idle it. Turn the A/C switch on. Remove the A/C relay. Does the A/C magnetic clutch disengage? | Yes | Inspect for the following: A/C relay is stuck closed. Short to GND in wiring harness between A/C relay and PCM terminal 1N. If both items normal, go to the next step. |
| No | Inspect if circuit between the A/C relay and magnetic clutch shorts to battery power circuit. If the circuit is normal, inspect the magnetic clutch for stuck engagement or clearance. |
| 3 | Disconnect refrigerant pressure switch connector. Start the engine and turn A/C switch on. NOTE: A/C should not work when disconnecting connector. If A/C remains working, short to GND circuit may be present. Does the A/C remain working? | Yes | Inspect for short to GND in wiring harness between refrigerant pressure switch and PCM terminal 1R. |
| No | Go to the next step. |
| 4 | Reconnect refrigerant pressure switch connector. Turn off A/C switch. NOTE: A/C should not work when turning A/C switch off. If A/C remains working, short to GND circuit may be present. Does A/C remain working? | Yes | Inspect following: Short to GND in wiring harness between A/C switch and A/C amplifier Short to GND circuit between A/C amplifier and refrigerant pressure switch |
| No | Inspect whether A/C switch is stuck closed. |
| 5 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
| NOTE |
|---|
| A/C should not work when disconnecting connector. If A/C remains working, short to GND circuit may be present. |
| NOTE |
|---|
| A/C should not work when turning A/C switch off. If A/C remains working, short to GND circuit may be present. |
NO. 24 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Does A/C compressor disengage when the A/C switch is turned off? | Yes | Go to the next step. |
| No | Go to symptom troubleshooting " NO. 24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY ". |
| 2 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Inspect accelerator pedal position sensor. |
| 3 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Are any driveability or exhaust smoke concerns present? | Yes | Go to the appropriate flow chart. |
| No | Go to the next step. |
| 2 | Inspect the following: Electrical connections Vacuum lines Fuel quality Are all items normal? | Yes | Go to the next step. |
| No | Service if necessary. Repeat Step 2. |
| 3 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 4 | Install the fuel pressure gauge between the fuel pipe and the fuel distributor. Start engine and idle it. Is fuel line pressure correct at idle? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Low: Inspect fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 5 | Inspect the charcoal canister for fuel saturation. Is excess amount of liquid fuel present in canister? | Yes | Replace the charcoal canister. |
| No | Inspect the fuel tank vent system. If the fuel tank vent system is normal, suggest trying a different brand since sulphur content can vary in different fuels. If the fuel tank vent system is not normal, repair or replace the malfunctioning part. |
| 6 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 26 EXHAUST SULPHUR SMELL (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 2 | Remove the fuel-filler pipe. Make sure the nonreturn valve is installed properly. Inspect nonreturn valve operation. Is the nonreturn valve normal? | Yes | Inspect for the following: Improper use of fuel nozzle Inadequate fuel filling speed |
| No | Nonreturn valve is installed improperly: Reinstall nonreturn valve to proper position. Nonreturn valve does not operate properly: Replace nonreturn valve. |
| 3 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 27 FUEL REFILL CONCERNS (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | ACTION |
|---|
| 1 | Connect the M-MDS to the DLC-2. Turn the ignition switch to the ON position (Engine off). Retrieve any DTCs. Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC inspection. See DTC TABLE [MZI-3.7] . |
| No | No DTC is displayed: Go to the next step. |
| 2 | Remove the fuel-filler pipe. Make sure the nonreturn valve is installed properly. Inspect nonreturn valve operation. Is the nonreturn valve normal? | Yes | Inspect for the following: Improper use of fuel nozzle Fuel is not inserted correctly. Inspect fuel shut-off valve. |
| No | Nonreturn valve is installed improperly: Reinstall the nonreturn valve to proper position. Nonreturn valve does not operate properly: Replace the nonreturn valve. |
| 3 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 28 FUEL FILLING SHUT OFF CONCERNS (MZI-3.7) DIAGNOSTIC PROCEDURE
| STEP | INSPECTION | RESULTS | ACTION |
|---|
| 1 | Remove all the spark plugs. Inspect spark plug condition. Is spark plug condition normal? | Yes | Troubleshooting completed. |
| No | Specific plug is wet or covered with carbon: Go to the next step. Specific plug looks grayish white: Go to Step 7. All plugs are wet or covered with carbon: Go to Step 9. All plugs look grayish white: Go to Step 15. |
| 2 | Are the spark plug wet/covered with carbon by the engine oil? | Yes | Inspect all areas related to oil, working up and down. |
| No | Go to the next step. |
| 3 | Inspect the spark plug for the following: Cracked insulator Heat range Air gap Worn electrode Is the spark plug normal? | Yes | Go to the next step. |
| No | Replace the spark plug. See SPARK PLUG REMOVAL/INSTALLATION [MZI-3.7] . |
| 4 | Inspect compression pressure at suspected malfunctioning cylinder. Is compression pressure correct? See COMPRESSION INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 5 | Install all spark plugs. Perform the spark test at suspected malfunctioning cylinder. Is strong blue spark visible? (Compare with normal cylinder. | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 6 | Install the fuel pressure gauge between fuel filter and fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position (Engine off). Is the fuel line pressure correct with the ignition switch at ON? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Inspect fuel injector for the following: Open or short circuit in injector Leakage Injection volume |
| No | Zero or low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 7 | Inspect the spark plug for the following. Heat range Air gap Is the spark plug normal? | Yes | Go to the next step. |
| No | Replace the spark plug. See SPARK PLUG REMOVAL/INSTALLATION [MZI-3.7] . |
| 8 | Remove the suspected fuel injector. Inspect the following: Resistance Fuel injection volume See FUEL INJECTOR INSPECTION [MZI-3.7] . Are all above items normal? | Yes | Inspect for open circuit in wiring harness between fuel injector connector terminal A and PCM at the following terminals: For No. 1 cylinder: 2BJ For No. 2 cylinder: 2BM For No. 3 cylinder: 2BF For No. 4 cylinder: 2BH For No. 5 cylinder: 2BB For No. 6 cylinder: 2BD |
| No | Replace the fuel injector. |
| 9 | Is the air cleaner element free of clogging? | Yes | Go to the next step. |
| No | Replace the air cleaner element. |
| 10 | Perform the spark test. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Is strong blue spark visible at each cylinder? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 11 | Install the fuel pressure gauge between the fuel filter and fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position (Engine off). Is the fuel line pressure correct with ignition switch at ON? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Go to the next step. |
| No | Zero or low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 12 | Inspect the following PIDs: ECT O2S11 (When engine can be started. O2S12 (When engine can be started. O2S21 (When engine can be started. O2S22 (When engine can be started. MAF See PCM INSPECTION [MZI-3.7] . Are PIDs normal? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 13 | Perform the purge control inspection. (When engine can be started. See ENGINE CONTROL SYSTEM OPERATION INSPECTION [MZI-3.7] . Is the purge control correct? | Yes | Go to the next step. |
| No | Repair or replace the malfunctioning part. |
| 14 | Perform compression inspection. See COMPRESSION INSPECTION [MZI-3.7] . Is compression correct? | Yes | Visually inspect for deformed exhaust system part. |
| No | Repair or replace the malfunctioning part. |
| 15 | When the engine cannot be started, inspect the intake-air system for air leakage. When the engine can be started, perform intake manifold vacuum inspection. Is air sucked in from intake-air system? | Yes | Repair or replace the malfunctioning part. |
| No | Go to the next step. |
| 16 | Install the fuel pressure gauge Between the fuel filter and the fuel distributor. Short check connector terminal F/P to body GND using a jumper wiring. Turn the ignition switch to the ON position (Engine off). Is fuel line pressure correct with the ignition switch at ON? See FUEL LINE PRESSURE INSPECTION [MZI-3.7] . | Yes | Inspect the following PIDs: ECT O2S11 O2S12 O2S21 O2S22 MAF See PCM INSPECTION [MZI-3.7] . Inspect PCM GND condition. |
| No | Zero or low: Inspect the fuel pump relay and fuel pump circuit. Inspect the fuel line for clogging. If there is no malfunction, replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . High: Replace the fuel pump unit. See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7] . |
| 17 | Verify test results. If normal, return to diagnostic index to service any additional symptoms. See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] . If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace the PCM. See PCM REMOVAL/INSTALLATION [MZI-3.7] . |
NO. 29 SPARK PLUG CONDITION (MZI-3.7) DIAGNOSTIC PROCEDURE
Inspection Method for Sensors
- Connect the M-MDS to the DLC-2.
- Turn the ignition switch to the ON position (Engine off). NOTE: If the engine starts and runs, perform the following steps during idle.
- Access PIDs for the switch you are inspecting.
- Vibrate the sensor slightly with your finger. If PID value is unstable or malfunction occurs, check for poor connection or poorly mounted sensor or both.
Scheme 9
Scheme 9: Inspection Method for Actuators or Relays
- Connect the M-MDS to the DLC-2.
- Turn the ignition switch to the ON position (Engine off). NOTE: If the engine starts and runs, perform the following steps during idle.
- Prepare the output state control function for actuators or relays that you are inspecting.
- Vibrate the actuator or relay with your finger for 3 s after output state control function is activated. If variable click sound is heard, check for poor connection or poorly mounted actuator or both, or the relay. NOTE: Vibrating relays too strongly may result in open relays.
Input Signal System Inspection Procedure
- Find an irregular signal. See «FINDING IRREGULAR SIGNALS»(ref-345353-S07712697852009102000000) .
- Locate source. See «LOCATING THE SOURCE OF UNUSUAL SIGNALS»(ref-345353-S03569020982009102000000) .
- Repair or replace the malfunctioning part.
- Confirm that the irregular signal is no longer detected.
Input Signal System Inspection For Variable Resistance Type 1
- When an irregular signal is detected, 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 the M-MDS voltages, inspect the wiring harness for open or short circuits. If the sensor and the 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.
Standard Power Supply System Inspection 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 is 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 wiring harness Harness/pin crimp is loose or disconnected.
GND System Inspection 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 wiring harness Female terminal opening is loose causing an open or short circuit in wiring harness Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
Scheme 10
Scheme 10: Variable Resistance Type 2 (mass Air Flow (MAF) Sensor & VSS)
GND System Inspection 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 wiring harness Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
Input Signal System Inspection For Variable Resistance Type 2
- When an irregular signal is detected, 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 the M-MDS voltages, inspect the wiring harness for open or short circuits. If the sensor and the 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.
Electrical Supply System Inspection 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 wiring harness Harness/pin crimp is loose or disconnected.
Scheme 11
Scheme 11: Thermistor Type (IAT Sensor & CHT Sensor)
Input Signal System Inspection For Thermistor Type
- When an irregular signal is detected, 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 the M-MDS voltages, inspect the wiring harness for open or short circuits. If the sensor and the 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.
GND System Inspection 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 wiring harness Female terminal opening is loose. Coupler (pin holder) damage Pin discoloration (blackness) Harness/pin crimp is loose or disconnected.
Engine Coolant Temperature Compensation Inspection
- Connect the M-MDS to the DLC-2.
- Access the following PIDs: ECT IAT RPM
- Verify that the engine is cold, then start the engine.
- Verify that the engine speed decreases as the engine warms up. If the engine speed does not decrease or decreases slowly, inspect the following: CHT sensor and related wiring harness See «CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI-3.7]»(ref-345345-S27870887622009102000000) . Electronic throttle body and related wiring harness See «THROTTLE BODY INSPECTION [MZI-3.7]»(ref-345348-S39916460862009102000000) .
Load Compensation Inspection
- Start the engine and idle it.
- Connect the M-MDS to the DLC-2.
- Verify that P0506, P0507 is not displayed. If P0506, P0507 are displayed, perform DTC inspection. See «DTC TABLE [MZI-3.7]»(ref-345342-S02066164152009102000000) .
- Access the RPM PID. NOTE: Excludes temporary idle speed drop just after the loads are turned on.
- Verify that the engine speed is within the specification under each load condition. If load condition is not as specified, inspect the following: A/C switch and related wiring harness See «FRONT CLIMATE CONTROL UNIT INSPECTION»(ref-345335-S13070296012009102000000) . Fan switch and related wiring harness See «FRONT CLIMATE CONTROL UNIT INSPECTION»(ref-345335-S13070296012009102000000) .
Throttle position (TP) Sweep Inspection
- Connect the M-MDS to the DLC-2.
- Turn the ignition switch to the ON position.
- Verify that none of the following DTC are displayed: P0122, P0123, P0222, P0223, P2101, P2107, P2112, P2122, P2123, P2127, P2128, P2135 If any one DTC is displayed, perform DTC inspection.
- Access TP1, TP2 PID.
- Verify that the PID reading is within the CTP value. See «PCM INSPECTION [MZI-3.7]»(ref-345345-S10259118212009102000000) . If the PID reading is out of range, perform the following: Remove the air duct from the throttle valve body. Verify that the throttle valve opens when the accelerator pedal is depressed. If the throttle valve opens, inspect the throttle position sensor and related wiring harness. If the throttle valve does not open, inspect the throttle actuator control motor and related wiring harness.
- Gradually depress the throttle pedal and verify that the PID reading increases accordingly. If the PID reading drops momentarily, inspect the following: Throttle position sensor
- Fully depress the throttle pedal and verify that the PID reading is within WOT value. See «PCM INSPECTION [MZI-3.7]»(ref-345345-S10259118212009102000000) . If the PID reading is out of range, perform the followings: Remove the air duct from throttle valve body. Verify that the throttle valve opens when throttle pedal is depressed. If the throttle valve opens, inspect the throttle position sensor and related wiring harness. If the throttle valve does not open, inspect the throttle actuator control motor and related wiring harness.
Fuel Cut Control System Inspection
Note. This inspection has to perform after the Fuel Injector Operation Inspection.
If simulation function of the M-MDS is used
- Warm up the engine and idle it.
- Connect the M-MDS to the DLC-2.
- Select the RPM and FUELSYS1 PIDs.
- Monitor the both PIDs while performing the following steps. Depress the accelerator pedal and increase the RPM PID to 4,000 rpm. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the FUELSYS1 PID is OL, and CL. when the RPM PID drops below 1,200 rpm. If not as specified, inspect the following. CHT sensor and related harness See «CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI-3.7]»(ref-345345-S27870887622009102000000) . TR switch and related wiring harness See «TRANSAXLE RANGE (TR) SWITCH INSPECTION [AW6A-EL, AW6AX-EL]»(ref-345375-S39309801742009102000000) .
If simulation function of the M-MDS is not used
- Warm up the engine and idle it.
- Measure the fuel injector control signal wave profile using the oscilloscope while performing the following steps. Depress the accelerator pedal and increase the engine speed to 4,000 rpm. Quickly release the accelerator pedal (brake pedal is not depressed) and verify that the wave profile constant B+ , and appears wave, when the engine speed drops below 2,200 rpm. If not as specified, inspect the following. CHT sensor and related harness See «CYLINDER HEAD TEMPERATURE (CHT) SENSOR INSPECTION [MZI-3.7]»(ref-345345-S27870887622009102000000) . TR switch and related wiring harness See «TRANSAXLE RANGE (TR) SWITCH INSPECTION [AW6A-EL, AW6AX-EL]»(ref-345375-S39309801742009102000000) .
Fuel Pump Control System Inspection
- Crank the engine and verify that fuel pump relay operation sound is heard.
- If operation sound is not heard, inspect the following: Fuel pump relay See «RELAY INSPECTION»(ref-345351-S01222475172009102000000) . Wiring harness and connectors (Main relay-fuel pump relay-PCM terminal 1V)
Spark Test
- Disconnect the fuel pump relay.
- Verify that each ignition coil and connector is connected properly.
- Inspect the ignition system in the following procedure. WARNING: High voltage in the ignition system can cause strong electrical shock which can result in serious injury. Avoid direct contact to the vehicle body during the following spark test.
| STEP | INSPECTION | ACTION |
|---|
| 1 | Disconnect the ignition coil from the spark plugs. Remove the spark plugs. Ensure that the spark plugs don't have carbon deposits. Are the spark plugs OK? | Yes | Go to the next step. |
| No | Perform 2 times of no-load racing at 4000 rpm for 2 min to burn off the carbon deposits. Then repeat this step. |
| 2 | Inspect the spark plugs for damage, wear, and proper plug gap. Are the spark plugs normal? | Yes | Go to the next step. |
| No | Replace spark plugs, then go to the next step. |
| 3 | Reconnect the spark plugs to the ignition coil. Ground the spark plugs to the engine. Is a strong blue spark visible at each cylinder while cranking? | Yes | Ignition system is normal. |
| No | Some cylinders do not spark: Go to the next step. All cylinders do not spark: Go to Step 5. |
| 4 | Inspect the following wiring harnesses for open or short: Ignition coil No. 1 terminal C-PCM terminal 2A Ignition coil No. 2 terminal C-PCM terminal 2F Ignition coil No. 3 terminal C-PCM terminal 2K Ignition coil No. 4 terminal C-PCM terminal 2W Ignition coil No. 5 terminal C-PCM terminal 2AA Ignition coil No. 6 terminal C-PCM terminal 2AE Are the wiring harnesses normal? | Yes | Inspect and replace the ignition coil. See IGNITION COIL INSPECTION [MZI-3.7] . |
| No | Repair or replace the malfunctioning part, then go to Step 1. |
| 5 | Measure the voltage at terminal A in each ignition coils. Is the voltage B+? | Yes | Go to the next step. |
| No | Inspect power supply circuit of ignition coils. |
| 6 | Verify continuity between each ignition coils terminal B and battery negative post. Is there any continuity? | Yes | Go to the next step. |
| No | Inspect GND circuit of ignition coils. |
| 7 | Does the PCM connector or ignition coil connectors have poor connection? | Yes | Repair or replace the connector, then go to Step 1. |
| No | Go to the next step. |
| 8 | Are the following parts normal? CKP sensor and crankshaft pulley | Yes | Inspect for open or short circuit in wiring harness and connector of CKP sensor. |
| No | Repair or replace the malfunctioning part, then go to Step 1. |
FUEL PUMP CONTROL SYSTEM INSPECTION CHART
Purge Control System Inspection
If simulation function of the M-MDS is used
- Start the engine.
- Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.
- Put the finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold. If there is a vacuum, inspect the following: Wiring harness and connectors (Purge solenoid valve-PCM terminal 1BC) Purge solenoid vale (stuck open)
- Connect the M-MDS to the DLC-2 and verify that the DTC P0443 is shown. Perform the DTC inspection. See «DTC TABLE [MZI-3.7]»(ref-345342-S02066164152009102000000) .
- Select EVAPCP PID.
- Increase the duty value of the purge valve to 50 % and inspect if the operation sound of the valve is heard. If the operation sound is heard, inspect for the loose or damaged vacuum hose. (Intake manifold-purge solenoid valve-charcoal canister) If the operation sound is not heard, perform the purge solenoid valve inspection. See «PURGE SOLENOID VALVE INSPECTION [MZI-3.7]»(ref-345354-S29783663092009102000000) .
- Warm up the engine to normal operating temperature.
- Monitor the EVAPCP PID using the M-MDS, and drive the vehicle approx. 2,000 rpm for 30 sec. or more. If the EVAPCP PID is 0 % , inspect the following. MAF, APP1, APP2, APP3, TP_REL and LOAD PIDs.
If simulation function of the M-MDS is not used
- Start the engine.
- Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.
- Put the finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is cold. If there is a vacuum, inspect the following: Wiring harness and connectors (Purge solenoid valve-PCM terminal 1BC) Purge solenoid vale (stuck open)
- Connect the M-MDS to the DLC-2 and verify that the DTC P0443 is shown. Perform the DTC inspection. See «DTC TABLE [MZI-3.7]»(ref-345342-S02066164152009102000000) .
- Access EVAPCP and ECT PIDs.
- Verify that the ECT PID is more than 78°C {173°F}. If the ECT PID reading indicates less than 78°C {173°F} , perform the ECT inspection.
- Set the vehicle on the dynamometer or chassis roller. WARNING: When the dynamometer or chassis roller is operating, there is a possibility that the operator may come into contact with or be caught up in the rotating parts, leading to serious injuries or death. When performing work while the dynamometer or chassis roller is operating, be careful not to come into contact with or caught up in any of the rotating parts.
- Drive the vehicle approx. 2,000 rpm for 30 sec. or more. If there is no vacuum, inspect the following: Wiring harness and connector (Main relay-purge solenoid valve-PCM terminal 1BC) Purge solenoid valve MAF, APP1, APP2, APP3, TP_REL and LOAD PISs If there is vacuum, inspect the following: Vacuum hose (Purge solenoid valve-charcoal canister)
A/C Cut-Off Control System Inspection
- Start the engine.
- Turn the A/C switch and the fan switch on.
- Verify that the A/C compressor magnetic clutch actuates. If it does not actuate, go to symptom troubleshooting "No. 23 A/C does not work sufficiently".
- Fully open the throttle valve and verify that the A/C compressor magnetic clutch does not actuate for 2-5 s. If it actuates, inspect as follows: A/C relay Open or short to GND circuit in wiring harness and connectors (Ignition switch-A/C relay-PCM terminal 1N) A/C related parts APP1, APP2, APP3 PIDs
Cooling Fan Control System Inspection
- Connect the M-MDS to the DLC-2.
- Start the engine and warm it up to normal operating temperature.
- Perform the KOER self-test. See «KOEO/KOER SELF TEST [MZI-3.7]»(ref-345342-S42085875682009102000000) .
- Verify that the DTC P0480 is not shown and the cooling fan operates during the KOER self-test. If DTC P0480 is shown, perform the DTC troubleshooting procedure. See «DTC TABLE [MZI-3.7]»(ref-345342-S02066164152009102000000) . If the cooling fans do not operate, proceed to the following: Verify the clicking sound of the cooling fan relay when the ignition switch is turned from the off to the ON position. If there is no the clicking sound, inspect the cooling fan relay for an open circuit between the ignition switch and the cooling fan relay. If there is a clicking sound, go to the next step. Inspect the following parts in the indicated order in accordance with fan operation conditions.
Evaporative Emission (EVAP) System Leak Inspection
- To verify that the problem has been fixed properly after repairs, the run drive cycle or EVAP system leak inspection must be performed.
EVAP System Leak Inspection Using The M-MDS
Note. Use the IDS (laptop PC) because the PDS (Pocket PC) does not support the EVAP system test.
EVAP System Test Out Line
- The EVAP system test, which can substituted for the run drive cycle as an EVAP control system repair confirmation method, can detect the small/large leak or blockage without run-drive cycle. NOTE: M-MDS can not detect "VERY SMALL LEAK". To identify the leak point, please use the leak tester or ultrasonic leak detector.
Scheme 12
Scheme 12: EVAP System Test Description
Scheme 13
Scheme 14
- The EVAP system test finds gas leaks or blockage of EVAP system using the changes of the fuel tank pressure. This test starts after sending an on-demand test signal from the M-MDS to the PCM. This test consists of three stages, and each stage is performed automatically as follows: Stage 1 test. (Test for large leak or blockage) M-MDS send the stage 1 test start signal to the PCM. PCM controls the CV solenoid valve and purge solenoid valve to control the tank pressure to the targeted value. M-MDS detect the large leak or the purge line blockage if the tank pressure does not arrive at the target vacuum in specified period. Stage 2 test. (Test for small leak) When fuel tank pressure arrived at the targeted pressure at stage 1 test, M-MDS send the stage 2 test signal to the PCM to turn off the purge solenoid to keep the tank pressure. M-MDS detect the small leak if the tank pressure can not keep within the target in specified period. Stage 3 test. (Test for blockage) M-MDS send the stage 3 test signal to the PCM to turn off the CV solenoid for check the blockage of EVAP system. M-MDS detect blockage of the CV solenoid valve or air filter if the tank pressure does not arrive at the target (atmosphere).
![Scheme 5: QUICK DIAGNOSTIC CHART [MZI-3.7]](https://i.diagnostdata.com/repair/f4/f4ca5303e0f991ca3a893611e58a1943712923c5a6cbe8b35f100bd9cc9cb02f.webp)
