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Home >> Infiniti >> 2002 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1124: Throttle Control Motor Relay Circuit Shorted Or DTC P1126: Throttle Control Motor Relay Circuit Open >> Diagnostic Procedure
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Diagnostic Procedure

  1. Turn ignition off. Remove throttle control motor relay. See Figure . Measure voltage between ground and throttle control motor relay harness connector terminals No. 2 and 5 (White/Green wires on I35; White/Red wires on Maxima). See Figure . If battery voltage exists, go to step  3 . If battery voltage does not exist, go to next step.
  2. Check the following:
    • Check fuse No. 63 (15-amp) located in fuse and fusible link box on left side of engine compartment.
    • Check for open or short between throttle control motor relay and fuse.

    Repair as necessary.

  3. Disconnect ECM harness connector. See Figure . Check continuity of Red wire between throttle control motor relay harness connector terminal No. 3 and ECM harness connector terminal No. 102. See Figure . Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step  5 .
  4. Check the following:
    • Check for poor connection at Black, 8-pin connector F18 terminal No. 5 (Red wire). See Figure . Connector F18 is located on left side of engine compartment. See Figure or Figure .
    • Check for open or short between throttle control motor relay and ECM.

    Repair as necessary.

  5. Check continuity between throttle control motor relay harness connector terminal No. 1 (Blue/Orange wire on I35; Orange wire on Maxima) and ECM harness connector terminal No. 26 (Orange wire). Continuity should exist. Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step  7 .
  6. Check the following:
    • Check for poor connection at Super Multiple Junction (SMJ) connector M15 terminal 15D (Orange wire). See Figure . SMJ connector M15 is located under left side of instrument panel. See Figure or Figure .
    • Check for open or short between throttle control motor relay and ECM.
    • On I35, check for poor connection at White, 18-pin connector F53 terminal No. 10 (Orange wire). See Figure . Connector F53 is located near ECM. See Figure .
    • On Maxima, check for poor connection at White, 18-pin connector F55 terminal No. 6 (Orange wire). See Figure . Connector F55 is located near ECM. See Figure .

    On all models, repair as necessary.

  7. Using jumper wires, apply battery voltage between throttle control motor relay terminals No. 1 and 2. See Figure . Check continuity between terminals No. 3 and 5. Continuity should exist. Remove jumper wires. Continuity should not exist. If continuity is as specified, go to next step. If continuity is not as specified, replace throttle control motor relay.
  8. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
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