Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR A DTC C123A-ESP SYSTEM SENSORS CALIBRATION
NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.

With the scan tool, read and record DTC's.

With the scan tool, read and record Freeze Fame information.

With the scan tool, erase DTC's.

Cycle the ignition switch from off to on.

With the scan tool, read and record DTC's

Does the scan tool display: C123A-ESP SYSTEM SENSORS CALIBRATION?

Yes
1. Go To step 2).
No
1. Refer ABS-INTERMITTENT CONDITION .
2. Perform ABS VERIFICATION TEST - VER 1 .
2) CHECK THE WIRING HARNESS, TERMINALS, AND CONNECTORS
Visually inspect the related wiring harness. Look for any bruised, chafed, pierced, or partially broken wires.

Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) CHECK THE DYNAMICS SENSOR OUTPUT
CAUTION: Ensure brake capability is available before road testing.

Have an assistant test drive the vehicle while monitoring the Dynamics Sensor operation.

Was the Lateral Sensor output between 0.02 G to 0.16 G and the Yaw Sensor between 1.30° to 5.70°?

Yes
1. Replace the Anti-Lock Brake Module in accordance with the Service Information.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Replace the Dynamics Sensor in accordance with the Service Information.
2. Perform ABS VERIFICATION TEST - VER 1 .