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
| Terminal 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 | 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 & 10 | Wheel Speed Sensor | (1) 3.5 | At About 20 MPH | ||
| 11 | ECM Ground | 0 | Normal Condition | ||
| 12 & 13 | Not Used | - | - | ||
| 14 | Power Supply (Ignition) | 10-15 | With Ignition On | ||
| 15 | Not Used | - | - | ||
| 16 | Power Supply (Battery) | 10-15 | At All Times | ||
| 17 | Dump Solenoid | 0 | Normal Driving | ||
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