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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 |
3.5 |
At About 20 MPH |
| 17 |
Rear Wheel speed Sensor |
3.5 |
At About 20 MPH |