71 - Ram Read/Write

RAM READ/WRITE-71
For a complete wiring diagram, refer to Wiring Diagram Information.

When Monitored
Ignition on.

Set Condition
The CAB is unable to change, recognize or clear a value (bit) in RAM.

Possible Causes
- ANTI-LOCK BRAKE MODULE

Diagnostic Test
1. ANTI-LOCK BRAKE MODULE

NOTE: Diagnose and repair any Powertrain Control Module VIN or Communication DTCs before continuing with this test.

Turn the ignition on.
With the DRBIII (R) clear DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII (R) read DTCs.

Does the DTC reset?
Yes >> Replace the Controller Antilock Brake in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Inspect the wiring harness and connector on the CAB. Check for chafed, pierced, pinched, or partially broken wires. Check the connector for broken hold down tab, bent or pushed out terminals. repair as necessary.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test