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DTC Troubleshooting

TROUBLESHOOTING CHART

Step Action YES NO
1  Was "ABS Check" performed?  Go to Step 2. Go to ABS CHECK .
2 
  1. Check DTC for ABS (ESP®).

Is DTC U1073 detected? 		 Go to DTC U1073: CONTROL MODULE COMMUNICATION BUS OFF . Go to Step 3.
3 
  1. Check DTC for ECM.

Is DTC U0073 detected? 		 Go to DTC U0073: CONTROL MODULE COMMUNICATION BUS OFF . Go to Step 4.
4 
  1. Check connection of connectors of all control modules communicating by means of CAN.
  2. Check DTC for ABS (ESP®).

Is DTC U1100 detected? 		 Go to Step 5. Intermittent trouble. Check for intermittent referring to INTERMITTENT AND POOR CONNECTION INSPECTION .
5 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors of ABS (ESP®) control module, ECM and BCM communicating by means of CAN.
  3. Check CAN communication circuit between ABS (ESP®) control module, ECM and BCM for open, short and high resistance.

Is CAN communication circuit in good condition? 		 Go to Step 6. Repair or replace the CAN communication line.
6 
  1. Disconnect connectors of all control modules communicating by means of CAN.
  2. Connect connectors to ABS (ESP®) control module and ECM.
  3. Check DTC for ABS (ESP®).

Is DTC U1100 detected? 		 Go to Step 7. Go to Step 9.
7 
  1. Check DTC for BCM.

Is DTC U1100 detected? 		 Go to Step 8. Check ABS (ESP®) control module power and ground circuit. If circuit is OK, substitute a known-good ABS (ESP®) control module and recheck.
8 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors of ABS (ESP®) control module, ECM and BCM communicating by means of CAN.
  3. Measure resistance at following terminals.
    • Between "WHT/BLU" and "WHT" wire terminals of ESP® control module connector
    • Between "WHT/RED" and "RED" wire terminals of ESP® control module connector

Is resistance below 1 Ω? 		 Check ECM power and ground circuit. If circuit is OK, substitute a known-good ECM and recheck. Substitute a known-good ABS (ESP®) control module and recheck.
9 
  1. Turn ignition switch to OFF position.
  2. Check CAN communication circuit between disconnected control modules (other than ABS (ESP®) control module and ECM) for open, short and high resistance.

Is CAN communication circuit in good condition? 		 Go to Step 10. Repair or replace the CAN communication line.
10 
  1. Connect connectors of disconnected control modules communicating by means of CAN.
  2. Disconnect each connector.
    • ECM
    • TCM (for A/T model)
    • BCM
    • 4WD control module (if equipped)
    • Keyless start control module (if equipped)
    • Steering angle sensor (with ESP®)
  3. Check DTC for ABS (ESP®).

Is DTC U1140 detected? 		 Check ABS (ESP®) control module power and ground circuit. If circuits are OK, substitute a known-good ABS (ESP®) hydraulic unit/control module assembly and recheck. Check applicable control module power and ground circuit. If circuit is OK, substitute a known-good applicable control module and recheck.
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