Pinpoint Test R: DTC P189B:00

Four Wheel Drive (4WD) Systems - Electronic Shift


Pinpoint Test R: DTC P189B:00

Refer to Wiring Diagram Set 34, Four-Wheel Drive Systems for schematic and connector information. Diagrams By Number

NOTE: Place the Mode Select Switch (MSS) in 2H prior to carrying out a self-test of the Transfer Case Control Module (TCCM). This will disable the Electronic Locking Differential (ELD) field coil.

NOTE: Make sure the battery is fully charged before performing this pinpoint test.

Normal Operation

The vehicle must be engaged into either 4 wheel high or 4 wheel low mode in order to operate the rear ELD. When the MSS is engaged to lock the rear differential, a Pulse Width Modulated (PWM) signal is sent to the ELD field coil by the TCCM through circuit CCF31. This signal is a PWM signal which is initially 98% duty cycle to lock the differential and decreases to 40% duty cycle once the differential is locked. When the differential is starting to lock, the lamp will start to blink. When the differential is fully locked, the lamp will illuminate steady.

- DTC P189B:00 Axle Disconnect Input Switch Circuit High: No Sub Type Information - When not in locking mode, the TCCM senses whether circuit CCF32 has high voltage and if the differential is always engaged. This DTC will not set unless the MSS is set to 2H. If the MSS is functioning normally, the differential will immediately lock when the MSS is set to 4H or 4L. This DTC will only display during the self-test function.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- TCCM



PINPOINT TEST R: DTC P189B:00

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