Communication For Initilizing Impossible - Select Monitor Communication Failure

DIAGNOSIS:

Faulty harness connector

TROUBLE SYMPTOM:

ABS warning light remains on.

WIRING DIAGRAM:

Fig 1: Wiring Diagram

10C1: CHECK IGNITION SWITCH.
CHECK: Is ignition switch ON?
1. YES: Go to step 10C2.
2. NO: Turn ignition switch to ON, and select brake control mode using the select monitor.
10C2: CHECK GENERATOR.
1. Start the engine.
2. Idle the engine.
3. Measure voltage between generator and chassis ground.
Terminals
1. Generator B terminal (+) - Chassis ground (-):
Fig 2: Measuring Voltage Between Generator & Chassis Ground

CHECK: Is the voltage between 10 and 15 V?
1. YES: Go to step 10C3.
2. NO: Repair generator. See GENERATORS & REGULATORS .
10C3: CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.

CHECK: Is there poor contact at battery terminal?
1. YES: Repair battery terminal.
2. NO: Go to step 10C4.
10C4: CHECK COMMUNICATION OF SELECT MONITOR.
Using the select monitor, check whether communication to other system (such as engine, AT, etc.) can be executed normally.

CHECK: Are the name and year of the system displayed on the select monitor?
1. YES: Go to step 10C5.
2. NO: Repair select monitor communication cable and connector.
10C5: CHECK INSTALLATION OF ABSCM & H/U CONNECTOR.
Turn ignition switch to OFF.

CHECK: Is ABSCM & H/U connector inserted into ABSCM & H/U until the clamp locks onto it?
1. YES: Go to step 10C6.
2. NO: Insert ABSCM & H/U connector into ABSCM & H/U until the clamp locks onto it.
10C6: CHECK POWER SUPPLY OF ABSCM & H/U.
1. Disconnect connector from ABSCM & H/U.
2. Start engine.
3. Idle the engine.
4. Measure voltage between ABSCM & H/U connector and chassis ground.
Connector & terminal
1. (F49) No. 1 (+) - Chassis ground (-):
Fig 3: Measuring Voltage Between ABSCM & H/U Connector & Chassis Ground

CHECK: Is the voltage between 10 and 15 V?
1. YES: Go to step 10C7.
2. NO: Repair ABSCM & H/U power supply circuit.
10C7: CHECK GROUND CIRCUIT OF ABSCM & H/U.
1. Turn ignition switch to OFF.
2. Measure resistance between ABSCM & H/U connector and chassis ground.
Connector & terminal
1. (F49) No. 23 - Chassis ground:
Fig 4: Measuring Resistance Between ABSCM & H/U Connector & Chassis Ground

CHECK: Is the resistance less than 0.5ohm?
1. YES: Repair harness/connector between ABSCM & H/U and select monitor.
2. NO: Go to step 10C8.
10C8: CHECK HARNESS/CONNECTOR BETWEEN ABSCM & H/U AND DATA LINK CONNECTOR.
1. Turn ignition switch to OFF.
2. Measure resistance between ABSCM & H/U connector and data link connector.
Connector & terminal
1. (F49) No. 20-(B40) No. 5:
2. (F49) No. 5 -(B40) No. 4:
Fig 5: Measuring Resistance Between ABSCM & H/U Connector & Data Link

CHECK: Is the resistance less than 0.5 ohm?
1. YES: Repair harness and connector between ABSCM & H/U and data link connector.
2. NO: Go to step 10C9.
10C9: CHECK POOR CONTACT IN CONNECTORS.
CHECK: Is there poor contact in connectors between ABSCM & H/U and data link connector?
1. YES: Repair connector.
2. NO: Replace ABSCM & H/U, see ABS CONTROL MODULE AND HYDRAULIC CONTROL UNIT (ABSCM & H/U) .