RWAL System Electrical Circuit Check
- Remove RWAL ECM 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 connector under conditions described in RWAL ECM PIN VOLTAGES table. See Figure .
RWAL ECM PIN VOLTAGES
| Term No. | Circuit | Normal 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 | Test Terminal Is Open | ||
| 0-0.5 | Test Terminal is Grounded | ||||
| 8 | Stoplight Switch | 0-0.5 | No Brake Applied | ||
| 10-15 | Brake Applied | ||||
| 9 | Dump Valve solenoid | 0 | Normal Driving | ||
| 10 | Power Supply (Battery) | 10-15 | Normal Condition | ||
| 11 | Not Used | ||||
| 12 | Power Supply (Ignition) | 10-15 | With Ignition On | ||
| 13 | Not Used | ||||
| 14 | Not Used | ||||
| 15 | ECM Ground | 0 | Normal Condition | ||
| 16 | Rear Wheel speed Sensor | (1) 3.5 | At About 20 MPH | ||
| 17 | Rear Wheel speed Sensor | (1) 3.5 | At About 20 MPH | ||
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