548 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Harness Resistance Checks (Check with breakout box connected to chassis harness
only. Check from
ECM to sensor harness connector.)
X4–10toA
<5Ω If > 5 Ω, check for open circuit.
X4–9 to B
<5Ω If > 5 Ω, check for open circuit.
Operation Checks for VSS (Check with breakout box connected to ECM
and chassis harness. Turn the
ignition switch to ON.)
X4–10 to X4–9
> 2 V AC If < 2 V AC, check sensor adjustment or replace failed
sensor.
Note: If circuit checks are within specification and condition remains, see transmission manual for sensor
inspection and adjustment.
VSS Diagnostic Trouble Codes
DTC 141 = ECM detected low voltage across VSS circuit for > 0.5 seconds
DTC 1 42 = ECM detected high voltage across VSS circuit for > 0.5 seconds
DTC 215 = ECM detected VSS frequency signal >
4365 Hz
1
Connector 9260 is a 2-wire connector usually
locatedinthebatterybox. PinAisthe chassis ground connection for
the ECM and IDM. Refer to truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM
ground circuit information.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
To Next Page
Loading...
Need help?
General