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Test L: No Module/Network Communications - Bus Link

  1. Inspect NGS tester connector for physical damage, bent terminals or corrosion. Pay particular attention to terminals No. 2 and 10. Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
  2. Turn ignition off. Inspect Data Link Connector (DLC) for physical damage, bent terminals or corrosion. Pay particular attention to terminals No. 2 (Tan/Orange wire) and No. 10 (Pink/Light Blue wire). See Figure. Repair connector as necessary and retest system for normal operation. If connector is okay, go to next step.
  3. Disconnect PATS module 16-pin connector C222 located behind center of instrument panel. See Figure. Measure resistance of Tan/Orange wire between terminal No. 6 at PATS module connector and terminal No. 2 at DLC. See Figure and Figure. Also, measure resistance of Pink/Light Blue wire between terminal No. 5 at PATS module connector and terminal No. 10 at DLC. If both resistance readings are less than 5 ohms, go to next step. If any resistance reading is 5 ohms or more, repair Tan/Orange wire and/or Pink/Light Blue wire between DLC and PATS module. Retest system for normal operation.
  4. Turn ignition on. Measure voltage between the following DLC terminals:
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 4 (Black wire) at DLC. See Figure.
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 16 (Orange wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 4 (Black wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 16 (Orange wire) at DLC.

    If any reading indicates voltage, go to next step. If all readings indicate zero volts, replace PATS module. Retest system for normal operation.

  5. Turn ignition off. Reconnect PATS module 16-pin connector C222. Disconnect Powertrain Control Module (PCM) connector C202 located in engine compartment, at right side of firewall. Turn ignition on. Measure voltage between the following DLC terminals:
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 4 (Black wire) at DLC. See Figure.
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 16 (Orange wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 4 (Black wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 16 (Orange wire) at DLC.

    If any reading indicates voltage, on vehicles not equipped with Electronic Automatic Temperature Control (EATC), go to step 7). On vehicles equipped with EATC, go to next step. If all readings indicate zero volts, replace PCM. Retest system for normal operation.

  6. Turn ignition off. Disconnect module Black connector C297 located left center of instrument panel. See Figure. Measure voltage between the following DLC terminals:
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 4 (Black wire) at DLC. See Figure.
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 16 (Orange wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 4 (Black wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 16 (Orange wire) at DLC.

    If any reading indicates voltage, go to next step. If all readings indicate zero volts, replace EATC module. Retest system for normal operation.

  7. Turn ignition off. Disconnect 40-pin bulkhead connector C147 located at left rear corner engine compartment. See Figure. Turn ignition on. Measure voltage between the following DLC terminals:
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 4 (Black wire) at DLC. See Figure.
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 16 (Orange wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 4 (Black wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 16 (Orange wire) at DLC.

    If all readings indicate zero volts, go to next step. If any reading indicates voltage, repair Tan/Orange wire and/or Pink/Light Blue wire between bulkhead connector C147, DLC, PATS module and EATC. Retest system for normal operation.

  8. Turn ignition off. Reconnect bulkhead connector C147. Disconnect 42-pin bulkhead Gray connector C115. Connector is located at left rear corner engine compartment, right of brake booster.Turn ignition on. Measure voltage between the following DLC terminals:
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 4 (Black wire) at DLC. See Figure.
    • Measure voltage between terminals No. 2 (Tan/Orange wire) and No. 16 (Orange wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 4 (Black wire) at DLC.
    • Measure voltage between terminals No. 10 (Pink/Light Blue wire) and No. 16 (Orange wire) at DLC.

    If all readings indicate zero volts, repair Tan/Orange wire and/or Pink/Light Blue wire between bulkhead connector C115 and PCM. Retest system for normal operation. If any reading indicates voltage, repair Tan/Orange wire and/or Pink/Light Blue wire between bulkhead connector C147 and connector C115. Retest system for normal operation.

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