CAUSE C - CAN HI SHORTED TO GROUND
PROCEDURE OR ACTION:
1. Ensure truck power is OFF.
2. Ensure disconnection of EPR, ECM, and engine to main harness connector that carries the CAN circuit.
3. Change DMM to ohms scale. Verify DMM zero reading.
4. At the EPR connector, measure resistance between the Can Hi circuit and a clean vehicle ground.
Is resistance less than 0.5 ohms?
YES: CAN Hi wire is shorted to a ground circuit. Locate and repair/replace open wire/connection. See Wire
Harness Repair 2200SRM1128.
NO: Go to Cause D.
Diagnostic Trouble Codes Electrical System
Check the Service Manual section in Hypass Online for possible updates and check pertinent Grams
9030-20-
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