4WD CONTROL MODULE INSPECTION

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  Note
  • 4WD CM terminal voltage can vary depending on measuring conditions and vehicle aging, resulting in misdiagnosis. Therefore, it is necessary to perform an overall inspection of the input/output systems and 4WD CM to determine which part is malfunctioning.
  • With the 4WD CM connector connected, measure voltage by connecting the voltmeter negative (-) lead to the body ground and positive (+) lead to each 4WD CM terminal.

1. Measure voltage or resistance at each 4WD CM terminal using a voltmeter and an ohmmeter.

  • If not as specified, replace the 4WD CM.

Terminal Voltage List (Reference)

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Terminal | Signal | Input/ output | Connected to | Measuring item | Test condition | Voltage (V)/ Continuity | Inspection location in case of failure
--- | --- | --- | --- | --- | --- | --- | ---
A | Differential oil temperature sensor signal | Input | Differential oil temperature sensor | Voltage | Ignition key ON | Differential oil temperature 20°C {68°F} | 3.0 | • Inspect differential oil temperature sensor • Inspect related harness
Differential oil temperature 60°C {140°F} | 1.4
B | — | — | — | — | — | — | — | —
C | Differential oil temperature sensor GND | — | Differential oil temperature sensor | Continuity | Any condition | Yes | • Inspect related harness
D | — | — | — | — | — | — | — | —
E | — | — | — | — | — | — | — | —
F | — | — | — | — | — | — | — | —
G | CAN_H | Input/ output | — | Perform measurement during DTC inspection. | —
H | CAN_L | Input/ output | — | Perform measurement during DTC inspection. | —
I | Power supply (Ignition switch) | Input | Ignition key | Voltage | Ignition key ON | B+ | • Inspect fuse • Inspect related harness
Ignition key OFF | 1.0 or below
J | — | — | — | — | — | — | — | —
K | Power supply (Main) | Input | Battery | Voltage | Any condition | B+ | • Inspect fuse • Inspect related harness
L | — | — | — | — | — | — | — | —
M | — | — | — | — | — | — | — | —
N | Ground | — | Ground | Voltage | Any condition | 0 | • Inspect related harness
O | 4WD solenoid (+) | Output | 4WD solenoid | Voltage | Ignition key ON | B+ | • 4WD solenoid • Inspect related harness
Ignition key OFF | 1.0 or below
P | 4WD solenoid (-) | Output | 4WD solenoid | Voltage | Ignition key ON | B+ | • 4WD solenoid • Inspect related harness
Ignition key OFF | 1.0 or below