Signal Too High - Intermittent Fault

ECM-1400 MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
SIGNAL TOO HIGH - INTERMITTENT FAULT

Checking wiring and connectors



Check the reference voltage cable between control module connector terminal A58 (# A60) and manifold absolute pressure (MAP) sensor connector terminal 3 for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Hint: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 3 and the ground terminal should be approximately 5V.

Check the signal cable between control module connector terminal A23 (# A23) and manifold absolute pressure (MAP) sensor connector terminal 1 for an intermittent open-circuit according to [1][2]Checking Wiring and Terminals. Intermittent Faults Also check for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Hint: With the ignition on and the manifold absolute pressure (MAP) sensor connector disconnected, the voltage between terminal 1 and the ground terminal should be approximately 5V.

Check the ground lead between control module connector terminal A61 (# B3) and manifold absolute pressure (MAP) sensor connector terminal 2 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
- For information about signals, Pinout Values and Diagnostic Parameters
- To localize the manifold absolute pressure (MAP) sensor, Locations


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