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Pinpoint Test B - Main Relay Failure

  1. Check Voltage At Pin No. 17

    Measure and record battery voltage. Disconnect ECU 40-pin connector. Install Breakout Box (014-00322) with proper overlay. Connect a jumper wire between breakout box pins No. 19 and 1. Turn ignition on. Using DVOM, measure voltage between breakout box pins No. 17 and 1. If voltage is 10-18 volts and within .5 volt of recorded battery voltage, go to next step. If voltage is not 10-18 volts or is not within .5 volt of recorded battery voltage, go to step 3)

  2. Verify Code

    Reconnect ECU connector. Turn ignition on. Check ABS warning light. If light is on, go to next step. If light is off, fault is intermittent. Perform INTERMITTENT DIAGNOSIS PROCEDURE  .

  3. Retrieve Codes

    Using New Generation Star (NGS) tester or equivalent, retrieve codes. If Code 1185 is present, replace ECU and go to step 14). If any other codes are present, go to appropriate PINPOINT TEST for specified code. See the TROUBLE CODE DIRECTORY  .

  4. Check Fuse

    Turn ignition off. Remove and inspect 30-amp ABS fuse, located in power distribution box. If fuse is okay, go to step 7). If fuse is blown, go to next step.

  5. Check For Short To Ground

    Remove main relay. Measure resistance of Tan/Yellow wire between ground and main relay connector. If resistance is less than 10 ohms, repair short to ground in Tan/Yellow wire. If resistance is more than 10 ohms, go to next step.

  6. Check For Short To Ground

    Disconnect HCU 8-pin connector. Install Breakout Box (014-00322) with proper overlay. Measure resistance between breakout box pin No. 17 and pins No. 1 (Orange/Yellow wire) and No. 4 (Orange/ Yellow wire) at HCU connector. If resistance is less than 10 ohms, repair short to ground in Orange/Yellow wire. Go to step 14). If resistance is more than 10 ohms, replace main relay and go to step 14).

  7. Check Power To Fuse

    Remove 30-amp ABS fuse from power distribution center. Turn ignition on. Measure voltage between ground and power side of 30-amp fuse cavity. If battery voltage is present, go to next step. If battery voltage is not present, locate and repair open in power feed circuit. Go to step 14).

  8. Check For Open Circuit

    Turn ignition off. Remove main relay. Measure resistance of Tan/Yellow wire between 30-amp fuse holder and main relay connector. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, locate and repair open in Tan/Yellow wire. Go to step 14).

  9. Check For Short To Ground

    Turn ignition off. Measure resistance of Pink/Light Green wire between ground and pin No. 19 at ECU connector. If resistance is less than 10 ohms, locate and repair short to ground in Pink/Light Green wire and go to step 14). If resistance is more than 10 ohms, go to next step.

  10. Check For Open Circuit

    Turn ignition off. Measure resistance of Pink/Light Green wire between main relay connector and pin No. 19 at ECU connector. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, locate and repair open in Pink/Light Green wire and go to step 14).

  11. Check For Open Circuit

    Turn ignition off. Measure resistance of Orange/Yellow wire between main relay connector and pin No. 17 at ECU connector. If resistance is less than one ohm, go to next step. If resistance is more than one ohm, locate and repair open in Orange/Yellow wire and go to step 14).

  12. Check Relay Coil

    Remove main relay. Measure resistance between pins No. 85 (Light Blue/Pink wire) and No. 86 (Pink/Light Green wire) at main relay. If resistance is 60-80 ohms, go to next step. If resistance is not 60-80 ohms, replace relay and go to step 14).

  13. Check Voltage To Relay Coil

    Turn ignition on. Measure voltage between ground and Light Blue/Pink wire at relay connector. If battery voltage is present, replace relay and check system operation. If battery voltage is not present, repair open in Light Blue/Pink wire. Go to next step.

  14. Verify Repair

    Turn ignition off. Reconnect and reassemble all components. Clear all codes. Perform step 1) of DRIVE TEST  . Retrieve codes. If SYSTEM PASS is set, condition has been repaired and test is complete. If original code is set, repeat step 1). If a different code is set, go to appropriate PINPOINT TEST. See the TROUBLE CODE DIRECTORY  .
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