Signal Too Low - Intermittent Fault

ECM-6000 AIR CONDITIONING (A/C) RELAY
SIGNAL TOO LOW - INTERMITTENT FAULT

Checking wiring and connectors



Check control module and air conditioning (A/C) pressure sensor connector for contact resistance and oxidation according to [1][2]Checking Wiring and Terminals. Intermittent Faults and loose connections according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check signal cable between control module # B44 (# B54) and air conditioning (A/C) relay # 4 for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults and an intermittent short-circuit to ground according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Check cable between air conditioning (A/C) relay # 2 and fuse 5 (in the engine compartment integrated relay/fusebox) for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Other information
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the control module, Engine Control Module (ECM), Replacing
- To access/replace the air conditioning (A/C) relay, Replacing Relay In the Main Fuse Box
- To localize the outside temperature sensor, Locations
- For information about signals, Pinout Values and Diagnostic Parameters


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.