Test A: Powertrain Control Module (Pcm) Fault On Circuits No. 914 & 915
WARNING: This page is about a different car, the 1997 Mercury Grand Marquis and 1997 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- If DTC 0001 is retrieved for circuit No. 914 (Tan/Orange wire), go to next step. If DTC 0001 is not retrieved for circuit No. 914 (Tan/Orange wire), go to step 6).
- Disconnect 16-pin harness connector C102 (located on driver's side rear corner of engine compartment). Inspect connector and pin No. 1 (Tan/Orange wire) for damage or corrosion. If connector and pin No. 1 is okay, go to next step. If connector or pin No. 1 is damaged, repair as necessary. Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS .
- Measure resistance between Data Link Connector (DLC) pin No. 2 and female side of harness connector C102 terminal No. 1 (Tan/Orange wire). See Figure and Fig 1. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair circuit No. 914 (Tan/Orange wire). Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS .
- Disconnect PCM 104-pin connector C185 (located on driver's side rear corner of engine compartment). Inspect pin No. 16 and circuit No. 914 (Tan/Orange wire) for damage or corrosion. See Fig 2. If pin No. 16 and circuit are okay, go to next step. If pin No. 16 or circuit is damaged, repair as necessary. Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS .
- Measure resistance between PCM connector pin No. 16 and male side of harness connector C102 terminal No. 1 (Tan/Orange wire). If resistance is less than 5 ohms, perform QUICK TEST in TESTS W/CODES article in ENGINE PERFORMANCE section. If resistance is 5 ohms or more, repair circuit No. 914 (Tan/Orange wire) between PCM connector pin No. 16 and connector C102. Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS.
- Disconnect harness connector C102. Inspect connector and pin No. 9 (Pink/Light Blue wire) for damage or corrosion. If connector and pin No. 9 is okay, go to next step. If connector or pin No. 9 is damaged, repair as necessary. Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS .
- Measure resistance between Data Link Connector (DLC) pin No. 10 and female side of harness connector C102 terminal No. 9 (Pink/Light Blue wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair circuit No. 915 (Pink/Light Blue wire). Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS .
- Disconnect PCM 104-pin connector C185. Inspect pin No. 15 and circuit (Pink/Light Blue wire) for damage or corrosion. If pin No. 15 and circuit are okay, go to next step. If pin No. 15 or circuit is damaged, repair as necessary. Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS .
- Measure resistance between PCM connector pin No. 15 and male side of harness connector C102 terminal No. 9 (Pink/Light Blue wire). If resistance is less than 5 ohms, reconnect all components. Perform DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS . If resistance is 5 ohms or more, repair circuit No. 915 (Pink/Light Blue wire) between PCM connector and harness connector C102. Reconnect connectors. Repeat DATA LINK DIAGNOSTICS under COMMUNICATION NETWORK DIAGNOSTICS.