3000GT AWD V6-2972cc 3.0L DOHC Turbo (1991)
Ignition Timing Adjustment Connector: Testing and Inspection
Ignition Coil And Power Transistor
OPERATION
The ignition timing adjustment signal, is manually grounded by the technician to remove the ECU's control of the ignition timing. This is needed to
adjust the base ignition timing setting. If the circuit becomes grounded at any time, ECU control of the ignition system is disabled, the "Malfunction
Indicator Light" will come on, and the ECU will store a trouble code. Operation of the vehicle under these conditions can result in loss of power
and engine overheating.
OPERATION TEST
1. Start and warm the engine until the coolant temperature exceeds 80°C (176°F).
2. Connect an ignition timing light.
3. Observe ignition timing and note position of marks.
4. Connect jumper wire between ignition timing adjustment connector #1 and ground.
4. Observe ignition timing marks. Verify that the marks are now at specified base timing setting.
IGNITION TIMING:
5° BTDC ± 2°
5. If the ignition timing does not change, perform the harness test.
