DTC U1129 Isuzu
High Speed Cooling Fan Circuit Malfunction
High Speed Cooling Fan Circuit Malfunction
Description
Engine started, engine runtime over 5 seconds, system voltage over 10.0v, and the PCM detected the Actual and Commanded state of the High speed fan circuit did not match during the CCM test.
Cause and Solution
Cooling fan relay control circuit is open or shorted to groundCooling fan relay control circuit is shorted to system power (B+)Cooling fan relay power circuit is open (check the F19 fuse)Cooling fan relay is damaged or has failedPCM has
Video Guide
Diagnostic Info
- DTC Code: U1129
- Brand: Isuzu