Checking System Integrity

Visually check all wiring, harnesses, connectors and components for evidence of damage, overheating, shorting or looseness. If a fault is found, repair as necessary. If no faults are found, go to next step for non-turbo engines or step 5 for turbo engines.

NOTE: Non-turbo vehicle circuit testing begins at step 1. For circuit testing on turbo vehicles, go to step 5.

1) Checking Coil IDM To ECA Circuit (Non-Turbo Engines) Connect spark tester between coil secondary cable and ground. Crank engine. If spark is not present, go to step 2. If spark is present, connect test light between ignition coil IDM (Yellow/Blue wire) and PWR (Black/White wire). Crank engine. If test light flashes, replace ECA. If test light does not flash, repair IDM circuit.

2) Continuous IDM At Coil Disconnect coil connector. Connect test light between ignition coil IDM (Yellow/Blue wire) and PWR (Black/White wire). Crank engine. If test light does not flash, go to step 4. If test light flashes, measure voltage between ignition coil PWR wire and ground. If voltage is greater than 10 volts, replace coil. If not, repair PWR circuit.

3) Continuous IDM At Ignition Module Disconnect ignition module connector. Jumper PWR wire to connector. Ensure IDM wire is disconnected. Connect test light between ignition coil IDM (Yellow/Blue wire) and PWR (Black/White wire). Crank engine. If test light flashes, service IDM circuit between ignition module and coil. If test light does not flash, go to step 4.

4) Checking Power to Ignition Module Disconnect ignition module connector. Turn ignition on. Measure voltage between ignition module PWR terminal and ground. If voltage is greater than 10 volts, replace ignition module. If voltage is less than 10 volts, repair PWR circuit between ignition module and ignition switch.

Fig 1: IDM Circuit & Connector Identification (Turbo)

5) Checking Coil IDM To ECA Circuit (Turbo Engines) Connect spark tester between coil secondary cable and ground. Crank engine. If spark is not present, go to step 7. If spark is present, disconnect ignition module connector. Connect test light between VPWR (Red/Black wire) and SPOUT (Yellow/Black wire). Crank engine. If test light is on, check SPOUT wire for short to ground. If okay, replace ignition module.

6) If test light does not come on, turn ignition off. Disconnect the ECA connector and install Breakout Box. Check for continuity between Breakout Box test pin No. 36 and ignition module SPOUT terminal. If continuity is present, check SPOUT circuit for short circuit. If okay and no other codes are present, replace ECA. If continuity is not present, repair circuit between ignition module SPOUT terminal and ECA.

7) Continuous IDM At Coil Disconnect coil connector. Connect test light between ignition coil IDM (Blue/Red wire) and PWR (Black/White wire). Crank engine. If test light does not flash, go to step 8. If test light flashes, measure voltage between ignition coil PWR wire and ground. If voltage is greater than 10 volts, disconnect coil connector. Connect test light between PWR wire and coil ground wire. If light is on, replace coil. If not, repair coil ground wire.

8) Continuous IDM At Ignition Module Disconnect ignition module connector. Jumper PIP, SPOUT, VPWR, and GND wires to connector. Ensure IDM wire is disconnected. Connect test light between ignition module IDM (Yellow wire) and VPWR. Crank engine. If test light flashes, repair IDM circuit between ignition module and coil.

9) If test light does not flash, turn ignition on. Measure voltage between ignition module VPWR wire and ground. If voltage is less than 10 volts, repair VPWR circuit between ignition module and main relay. If voltage is greater than 10 volts, connect test light between ignition module VPWR wire and ignition module ground.

10) Checking Power to Ignition Module If test light does not come on, repair ignition module ground circuit. If test light is on, connect analog voltmeter between ignition module PIP wire and ground. Set voltmeter on 5-volt scale and crank engine. If voltmeter indicator pulses, go to step 12.

11) If voltmeter indicator does not pulse, turn ignition off and disconnect ECA. Install breakout box at ECA wire harness connector. Leave ECA disconnected. Check for continuity between Breakout Box PIP terminal and PIP terminal at ignition module. If continuity is present, service short in PIP wire and any remaining codes in ECA memory. If problem continues, replace ECA.

12) If voltmeter indicator did pulse in step 10, connect test light between ignition module VPWR wire and ignition module SPOUT wire. Crank engine. If light comes on, check ignition SPOUT wire for short to ground. If okay, replace ignition module.

13) If light does not come on, turn ignition off and disconnect ECA. Install Breakout Box at ECA wire harness connector. Leave ECA disconnected. Check for continuity between Breakout Box SPOUT terminal and SPOUT terminal at ignition module. If continuity is present, service short in SPOUT wire and any remaining codes in ECA memory. If problem continues, replace ECA. If continuity is not present, check wiring between ignition module SPOUT and ECA connector for wire for short or open circuit.