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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 over-voltage
or excessive noise trouble codes. If one of these is found,
troubleshoot these trouble codes first before the PMV.
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 7 Left Additional Axle Release
ECU is configured 9 Right Additional Axle Common
for 6 modulators) 10 Right Additional Axle Hold
13 Right Additional Axle Release
X4 6 Trailer PMV Hold
12 Way 9 Trailer PMV Release
12 Trailer PMV Common
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