DTC P1320 - IGNITION SIGNAL
Diagnostic Aid
If will start and idle, go to step 4). If engine will not start, go to next step.
1. Check Ground Circuit - Turn ignition off. Disconnect power transistor harness connector. See Fig. 26. Using an ohmmeter, check continuity between power transistor harness connector terminal "h" (Black wire) and ground. See Fig. 27. If no continuity exists, repair open in Black wire. If continuity exists, disconnect ignition coil harness connector, check continuity between power transistor harness connector terminal "i" and ignition coil harness connector terminal "b" (Green wire). If no continuity exists, repair open in Green wire. If continuity exists, go to next step.
2. Check Power Supply - Turn ignition on. Disconnect ignition coil. See Fig. 28. Harness connector. Using a voltmeter, measure voltage between ignition coil harness connector terminal "a" (Black/Red wire) and ground. See Fig. 29. If battery voltage does not exist, repair fault in Black/Red wire as required. If battery voltage exists, go to next step.
3. Check Power Transistor Input Signal Circuit - Turn ignition off. Disconnect ECM harness connector. See Fig. 1. Using an ohmmeter, check for continuity between ECM harness con nector terminal No. 1 and power transistor harness connector terminal "g" (White wire). See Fig. 3 and Fig. 26. If no continuity exists, repair open in White wire as required. If continuity exists, go to step 6).
4. Check Input Signal Circuit - Turn ignition off. Disconnect ignition coil harness connector. See Fig. 28. Strip tape covering resistor. Disconnect ECM harness connector. See Fig. 1. Using an ohmmeter, check continuity between resistor harness connector Green wire terminal and ignition coil harness connector Green wire terminal. If no continuity exists, repair open in Green wire. If continuity exists, go to next step.
5. Check continuity between resistor harness connector Yellow/Red wire terminal and ECM harness connector terminal No. 2 (Yellow/Red wire). See Fig. 3. If no continuity exists, repair open in Yellow/Red wire. If continuity exists, go to next step.
6. Check Ignition Coil - Disconnect ignition coil harness connector. Using an ohmmeter, check resistance between primary connector terminals. Resistance should be about 1.0 ohm at 68°F (20°C). Check resistance between ignition coil secondary tower and Black/Red wire (positive) terminal of coil primary connector. Resistance should be about 10,000 ohms at 68°F (20°C). If resistance is as specified, go to next step. If either resistance is not as specified, replace ignition coil and retest system.
7. Check Power Transistor - Disconnect power transistor harness connector. Check for continuity between power transistor terminals "b" and "c". If continuity is present, go to next step. If continuity is not present, replace power transistor and retest system.
8. Check Resistor - Disconnect resistor harness connector. Measure resistance across resistor terminals. Resistance should be 2200 ohms at 77°F (25°C). If resistance is correct, go to next step. If resistance is not correct, replace resistor and retest system.
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Tuesday, October 30th, 2012 AT 4:24 PM