P0302

DTC P0302; RANDOM MISFIRE DETECTED, MISFIRE DETECTED, (CYLINDERS 1-8) IGNITION COIL PRIMARY CIRCUIT MALFUNCTION, (CYLINDERS 1-8)

G290076t1 : CHECK COIL FUNCTION BY SUBSTITUTION
1. Swap the suspect coil for a known good unit.
2. CLEAR the DTC. TEST the system for normal operation.

- Does the same DTC reoccur? The DTC will indicate if the same cylinder is misfiring.

-> Yes
INSTALL a new coil. CLEAR the DTC. TEST the system for normal operation.

-> No

G290076t2 : CHECK THE IGNITION COIL SUPPLY VOLTAGE CIRCUIT
1. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
2. Turn the ignition switch to the ON position.
3. Make sure the ignition relay is energised.
4. Measure the voltage between:

- Is the voltage less than 10.5 Volts?

-> Yes
REPAIR the relevant ignition coil supply voltage circuit. This circuit includes the ignition relay, and the front power distribution box (fuse 1). CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t3 : CHECK THE IGNITION COIL GROUND CIRCUIT
1. Turn the ignition switch to the OFF position.
2. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
3. Measure the resistance between:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t4 : CHECK THE IGNITION COIL SWITCHING CIRCUITS FOR HIGH RESISTANCE
1. Disconnect the battery negative terminal.
2. Disconnect the ECM electrical connector, PI01.
3. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
4. Measure the resistance between:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t5 : CHECK THE IGNITION COIL (CYLS 1, 4, 6, AND 7) MONITOR CIRCUITS FOR HIGH RESISTANCE
1. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
2. Measure the resistance between:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. This circuit includes the harness splice, PIS09. CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t6 : CHECK THE IGNITION COIL (CYLS 1, 4, 6, AND 7) MONITOR CIRCUITS FOR SHORT TO B+ VOLTAGE
1. Reconnect the battery negative terminal.
2. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
3. Measure the voltage between:

- Is the voltage greater than 3 volts?

-> Yes
REPAIR the short to B+ voltage. CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t7 : CHECK THE IGNITION COIL (CYLS 1, 4, 6, AND 7) MONITOR CIRCUITS FOR SHORT TO GROUND
1. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
2. Measure the resistance between:

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short to GROUND. CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t8 : CHECK THE IGNITION COIL (CYLS 2, 3, 5, AND 8) MONITOR CIRCUITS FOR HIGH RESISTANCE
1. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
2. Measure the resistance between:

- Is the resistance greater than 5 ohms?

-> Yes
REPAIR the high resistance circuit. This circuit includes the harness splice, PIS10. CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t9 : CHECK THE IGNITION COIL (CYLS 2, 3, 5, AND 8) MONITOR CIRCUITS FOR SHORT TO B+ VOLTAGE
1. Reconnect the battery negative terminal.
2. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
3. Measure the voltage between:

- Is the voltage greater than 3 volts?

-> Yes
REPAIR the short to B+ voltage. CLEAR the DTCs. TEST the system for normal operation.

-> No

G290076t10 : CHECK THE IGNITION COIL (CYLS 2, 3, 5, AND 8) MONITOR CIRCUITS FOR SHORT TO GROUND
1. Disconnect the relevant ignition coil electrical connector(s), (PI02 to PI09).
2. Measure the resistance between:

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short to GROUND. CLEAR the DTCs. TEST the system for normal operation.

-> No
Contact dealer technical support for advice on possible ECM failure.