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Trouble shooting

DIAGNOSIS PROCEDURE

Step Action YES NO
1  Scan tool communication check 
Can scan tool communicate with BCM? 		 Go to Step 2. Go to Step 3.
2  ABS (ESP®) hydraulic unit / control module assembly power and ground circuit check 
  1. Check that ABS (ESP®) hydraulic unit / control module assembly power supply circuit and ground circuit is in good condition referring to ABS (ESP®) HYDRAULIC UNIT / CONTROL MODULE ASSEMBLY POWER AND GROUND CIRCUIT CHECK .

Are check results OK? 		 Go to Step 3. Repair ABS (ESP®) hydraulic unit / control module assembly power or ground circuit.
3  Data link connector power source circuit check 
  1. Disconnect scan tool from data link connector.
  2. Check for proper connection to scan tool.
  3. If OK then turn ignition switch to ON position, and measure voltage between terminal B of data link connector and vehicle body ground.

Is voltage 10 - 12 V? 		 Go to Step 4. Terminal B circuit open or shorted to ground.
4  Data link connector ground circuit check 
  1. Turn ignition switch to OFF position, and measure resistance between the following terminals:
    • Terminal G of data link connector and vehicle body ground.
    • Terminal G1 of data link connector and vehicle body ground.

Are resistance less than 2Ω? 		 Go to Step 5. Terminal G and/or G1 wire circuit open or high resistance.
5  Serial communication circuit check 
  1. Turn ignition switch to OFF position.
  2. Disconnect connectors of all control modules communicating by serial data circuit.
  3. Check proper connection at serial data circuit terminals.
  4. If OK, then check for high resistance, open or short to power circuit or ground in serial data circuit.

Is check result in good condition? 		 Go to Step 6. Repair serial data circuit and recheck.
6  CAN communication line circuit check 
  1. Disconnect connectors of all control modules communicating by means of CAN.
  2. Check for proper connection to CAN communication line wire.
  3. If OK then check CAN communication line circuit between control modules for open, short and high resistance.

Is each CAN communication line circuit in good condition? 		 Substitute a known-good ABS (ESP®) hydraulic unit / control module assembly and recheck. Repair CAN communication line circuit and recheck.
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