Diagnostic Aids
Perform this test only when directed here. This test is intended to diagnose the following:
- Idle switch.
- Idle switch circuits.
- Powertrain Control Module (PCM).
CIRCUIT PIN IDENTIFICATION
| Circuit | PCM Pin No. | Wire Color |
|---|---|---|
| IDL | 26 | Brown/Yellow |
| IGN | 38 | Blue/Yellow |
| TCM | TCM 17A | Red/Yellow |
- DTC 0510: Check Idle Switch Continuity
Turn ignition off. Disconnect idle switch harness connector. Ensure throttle is closed. Measure resistance between IDL Brown/Yellow wire and IGN Blue/Yellow wire terminals on idle switch. See CIRCUIT PIN IDENTIFICATION table. Also see Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, replace idle switch. Restore electrical connections and repeat QUICK TEST . - Check IDL Circuit For Open
Turn ignition off. Disconnect PCM. Measure resistance of IDL circuit (Brown/Yellow wire) between idle switch harness connector and PCM connector terminal No. 26. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, repair open Brown/Yellow wire. Restore electrical connections and repeat QUICK TEST . - Check IDL Circuit For Short To Ground
Turn ignition off. Disconnect PCM and idle switch connectors. Measure resistance of IDL circuit (Brown/Yellow wire) between PCM connector terminal No. 26 and negative battery terminal. If resistance is 10 k/ohms, go to next step. If resistance measurement is less than 10 k/ohms, repair Brown/Yellow wire for short to ground. Restore electrical connections and repeat QUICK TEST . - Check IDL Circuit For Short To Power
Turn ignition off. Disconnect PCM and idle switch connectors. Measure resistance between IDL circuit (Brown/Yellow wire) and VPWR (Black/White wire) circuit at PCM harness connector. If resistance is greater than 10 k/ohms, replace PCM. If resistance is less than 10 k/ohms, repair short to power in Brown/Yellow wire. Restore electrical connections and repeat QUICK TEST .