Pressure Modulator Valve Repair Tests:
1.Take all measurements at ECU harness connector pins in order to check wire harness and PMV. Probe the connector carefully so that the terminals are not damaged.
2.Pressure modulator resistance should read:
Location | Measurement |
Release to Common | 4.9 to 5.5 Ohms |
|
|
Hold to Common | 4.9 to 5.5 Ohms |
Release to Hold | 9.8 to 11.0 Ohms |
|
|
Release, Hold, Common | Open Circuit (no continuity) |
to Voltage or Ground |
|
Caution: When troubleshooting modulator trouble codes, check inactive trouble codes and event history for
Cab-mount ECU: Looking into wire harness connector
|
|
|
Connector | Pin | PMV Location |
| 1 | Left Steer Axle Hold |
| 2 | Left Steer Axle Release |
| 3 | Left Steer Axle Common |
X2 | 4 | Right Steer Axle Hold |
18 Way | 6 | Right Steer Axle Common |
| 7 | Right Steer Axle Release |
| 9 | Right Drive Axle Common |
| 10 | Right Drive Axle Hold |
| 13 | Right Drive Axle Release |
| 12 | Left Drive Axle Common |
| 16 | Left Drive Axle Hold |
| 17 | Left Drive Axle Release |
| 4 | Left Additional Axle Hold |
X3 | 6 | Left Additional Axle Common |
15 Way (if Premium | 7 | Left Additional Axle Release |
ECU is configured | 9 | Right Additional Axle Common |
for 6 sensors) | 10 | Right Additional Axle Hold |
| 13 | Right Additional Axle Release |
|
|
|
Frame-mount ECU: Looking into wire harness connector
|
|
|
Connector | Pin | PMV Location |
| 7 | Left Steer Axle Hold |
| 8 | Left Steer Axle Release |
| 13 | Left Steer Axle Common |
X2 | 9 | Right Steer Axle Hold |
18 Way | 10 | Right Steer Axle Release |
| 14 | Right Steer Axle Common |
| 11 | Left Drive Axle Hold |
| 12 | Left Drive Axle Release |
| 15 | Left Drive Axle Common |
| 16 | Right Drive Axle Common |
| 17 | Right Drive Axle Hold |
| 18 | Right Drive Axle Release |
| 9 | Left Additional Axle Hold |
X3 | 10 | Left Additional Axle Release |
15 Way (if Premium | 15 | Left Additional Axle Common |
ECU is configured | 16 | Right Additional Axle Common |
for 6 sensors) | 17 | Right Additional Axle Hold |
| 18 | Right Additional Axle Release |
|
|
|
21