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NO.6 STARTER CRANKS NORMALLY BUT WILL NOT START [WITH WU-TWC]

id0103008012c5

6 | STARTER CRANKS NORMALLY BUT WILL NOT START
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DESCRIPTION | • The starter cranks the engine at normal speed but the engine will not run. • Refer to symptom troubleshooting "No.5 Engine stalls" if this symptom appears after the engine stalls. • Fuel is in the tank. • The battery is in normal condition.
POSSIBLE CAUSE | • No battery power supply to PCM • Air leakage from intake-air system • Open PCM ground or vehicle body ground • Improper operation of IAC valve • EGR valve malfunction (ZJ) • No signal from CKP sensor due to sensor, related wiring harness or incorrect installation • No signal from CMP sensor due to sensor, related wiring harness or incorrect installation • Low engine compression • Engine overheating • Vacuum leakage • Erratic signal to ignition coil • Improper air/fuel mixture ratio control • Poor fuel quality • PCV valve malfunction • Air cleaner restriction • Restriction in exhaust system • Disconnected electrical connector • Open or short circuit in fuel pump body and related wiring harness • Inadequate fuel pressure • Fuel pump mechanical malfunction • Fuel leakage from injector • Fuel injector is clogged. • Purge solenoid valve malfunction • Spark plug malfunction • Ignition coil malfunction • Improper variable valve timing control system operation • Improper valve timing • Immobilizer system (PATS) and/or circuit malfunction (if equipped) • Pressure regulator malfunction Warning The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. Caution • If there is foreign material on the connecting area of the quick release connector, it might damage the connector or the fuel pipe. To prevent this, disconnect the connector and clean the connecting area before connecting.

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
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1 | Note • The following test should be performed for vehicles with an immobilizer system. Go to Step 10 for vehicles without an immobilizer system. Connect the WDS or equivalent to the DLC-2. Do any of following conditions appear? • Engine does not completely start. • DTC B1681 is displayed. | Yes | Both conditions appear: Go to Step 3.
No | Either condition appears: Go to the next step.
2 | Does the engine stall after approx. 2 s after the engine is started? | Yes | Go to the next step.
No | The immobilizer system is normal. Go to Step 10.
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 illuminate? | Yes | Go to the next step.
No | Inspect the instrument cluster and wiring harness.
5 | Connect the WDS equivalent to DLC-2 and retrieve DTCs. Are any of following DTCs displayed? DTC B1213, B1342, B1600, B1601, B1602, B1681, B2103, B2431 | Yes | Go to the applicable DTC test.
No | Go to the next step.
6 | Is there continuity between the PCM ground terminals 2AZ, 2BH, 2BD, and ground? | Yes | Go to the next step.
No | Repair or replace the wiring harness.
7 | Measure voltage between the PCM ground terminals 2AZ, 2BH, 2BD, and coil terminal C. Is the voltage 1.0 V or less? | Yes | Go to the next step.
No | Repair or replace the wiring harness.
8 | Turn the ignition switch to the ON position. Access the VPWR PID. Is the VPWR PID normal? VPWR PID Battery voltage | Yes | Go to the next step.
No | Repair or replace the wiring harness.
9 | Disconnect the coil connector. Turn the ignition switch to the ON position. Is there battery voltage at coil connector terminal D? | Yes | Inspect for the following: • Open or short circuit between coil terminal A and PCM terminal 1AS • Open or short circuit between coil terminal B and PCM terminal 1AO
No | Repair or replace the wiring harness between coil connector terminal D and the fuse panel.
10 | Inspect the following: • Vacuum connection • External fuel shut off or accessory (kill switch, alarm etc.) • Fuel quality: proper octane, contamination, winter/summer blend • No air leakage from intake-air system • Proper sealing of intake manifold and components attached to intake manifold: IAC valve • 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 10.
11 | Connect the WDS or equivalent to the DLC-2. Retrieve any continuous memory and KOEO DTCs. (See KOEO/KOER SELF-TEST.) Are there any DTCs displayed? | Yes | DTC is displayed: Go to the appropriate DTC test. Communication error message is displayed: Inspect for the following: • Open circuit between main relay and PCM terminal 1BF or 1BG • Open main relay ground circuit • Main relay is stuck open. • Open or poor ground circuit (PCM terminal 2BH, 2AZ or 2BD) • Poor connection of vehicle body ground
No | No DTC is displayed: Go to the next step.
12 | Does engine start with the throttle closed? | Yes | Go to Step 27.
No | Go to the next step.
13 | Does engine start and run smoothly at part throttle? | Yes | Inspect the IAC valve and wiring harness.
No | Go to the next step.
14 | Connect the WDS or equivalent to the DLC-2. Access the RPM PID. Does the RPM PID indicate 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 between CKP sensor terminal A and PCM terminal 2T • Open or short circuit between CKP sensor terminal B and PCM terminal 2P • Open or short circuit between CKP sensor terminal C and PCM terminal 2BF • Open or short circuit in CKP sensor harnesses If the CKP sensor and harness are normal, go to the next step.
15 | Visually inspect the CKP sensor and the teeth of the crankshaft pulley. Are the CKP sensor and the teeth of the crankshaft pulley normal? | Yes | Go to the next step.
No | Replace the malfunctionings parts.
16 | Measure the gap between the CKP sensor and the teeth of the crankshaft pulley. Specification 0.5-1.5 mm {0.02-0.05 in} Is the gap within specification? | Yes | Go to the next step.
No | Replace the plate.
17 | Inspect the ignition coil related wiring harness condition (intermittent open or short) for all cylinders. Are the wiring harness conditions normal? | Yes | Go to the next step.
No | Repair the suspected wiring harnesses.
18 | Carry out spark test. Is a strong blue spark visible at each cylinder? | Yes | Go to the next step.
No | Repair or replace the malfunctioning parts according to spark test result.
19 | Inspect the spark plugs. 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 fuel injector. Spark plug is grayish white: Inspect for clogged fuel injector.
No | Install 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 a fuel pressure gauge between the fuel pipe and the fuel distributor. Connect the WDS or equivalent to the DLC-2. Turn on and/or off using the FP PID in the output state control of the datalogger function. Is fuel line pressure correct when the FP PID is turned on/off five times? | Yes | Go to the next step.
No | Zero or low: Inspect the fuel pump relay and fuel pump related circuits. Inspect for fuel leakage inside pressure regulator. Inspect for a clogged main fuel line. High: Inspect the pressure regulator for the cause of high pressure. Inspect for a clogged fuel return line. Inspect the vacuum hose to the pressure regulator.
23 | Visually inspect for fuel leakage at the fuel injector O-ring and fuel line. Service if necessary. Turn off from on using the FP PID in the output state control of the datalogger function. Is the fuel line pressure held after FP PID is turned off? | Yes | Go to the next step.
No | Inspect the pressure regulator diaphragm. • If the condition is normal, inspect the fuel injector. • If the condition is not normal, replace the pressure regulator.
24 | Disconnect the vacuum hose between the purge solenoid valve and the intake manifold from the purge solenoid valve side. Plug the open end of the vacuum hose. Attempt to start the engine. Is starting condition improved? | Yes | Inspect if the purge solenoid valve sticks open mechanically. Inspect the evaporative emission control system.
No | Go to the next step.
25 | Is air leakage felt or heard at the intake-air system components while racing the engine to a higher speed? | Yes | Repair or replace.
No | Go to the next step. (with EGR system) Go to Step 27. (without EGR system)
26 | Inspect the engine condition while tapping the EGR valve housing. Does the engine condition improve? | Yes | Replace the EGR valve. (See EGR VALVE REMOVAL/INSTALLATION [WITH WU-TWC].)
No | Go to the next step.
27 | Inspect the variable valve timing control system operation. Does the variable valve timing control function properly? | Yes | Go to the next step.
No | Repair or replace malfunctioning parts.
28 | Is engine compression correct? | Yes | With EGR system: Remove the EGR valve and visually inspect for a mechanically stuck EGR valve. • If there is no malfunction, inspect valve timing. Without EGR system: Inspect the valve timing.
No | Inspect for cause.
29 | Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, inspect related Service information and perform repair or diagnosis. - If the vehicle is repaired, the troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.