RWAL System Electrical Circuit Check
- Remove RWAL EBCM from under dash so rear of harness connector can be accessed with a DVOM. See RWAL ELECTRONIC CONTROL MODULE under REMOVAL & INSTALLATION.
- Check voltage at each terminal of the connector under conditions as described in the RWAL EBCM PIN VOLTAGES table. Also, see Figure .
RWAL EBCM PIN VOLTAGES
| Terminal No./Voltage | Condition | ||||
|---|---|---|---|---|---|
| 1 | |||||
| Isolation Solenoid | |||||
| 0 | During Normal Driving | ||||
| 10-15 | During Hard Braking | ||||
| 2 | |||||
| BRAKE Warning Light | |||||
| 10-15 | When BRAKE Light Is Off | ||||
| 0-3 | When BRAKE Light Is On | ||||
| 3 | |||||
| 4WD Signal | |||||
| 10-15 | In 2WD | ||||
| 0-0.5 | In 4WD | ||||
| 4 | |||||
| Valve Reset Switch | |||||
| 4-5 | During Normal Driving | ||||
| 0-0.5 | During Hard Braking | ||||
| 5 | |||||
| Not Used | |||||
| 6 | |||||
| Not Used | |||||
| 7 | |||||
| Diagnostic Test | |||||
| 3-5 | When Terminal Is Open | ||||
| 0-0.5 | When Terminal Is Grounded | ||||
| 8 | |||||
| Stoplight Switch | |||||
| 0-0.5 | With Pedal Released | ||||
| 10-15 | With Pedal Depressed | ||||
| 9 | |||||
| Dump Valve Solenoid | |||||
| 0 | Normal Driving | ||||
| 10 | |||||
| Power Supply (Battery) | |||||
| 10-15 | Normal Condition | ||||
| 12 | |||||
| Power Supply (Ignition) | |||||
| 10-15 | With Ignition On | ||||
| 15 | |||||
| EBCM Ground | |||||
| 0 | Normal Condition | ||||
| 16 & 17 | |||||
| Wheel Speed Sensor | |||||
| (1) 3.5 | At About 20 MPH | ||||
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