Signal Too High

ECM-1300 MASS AIR FLOW (MAF) SENSOR
SIGNAL TOO HIGH

Diagnostic Trouble Code (DTC) status ECM-1300 Intake Air Temperature (IAT) Sensor. Signal too high
Reading DTC status ECM-1300



Note! When Reading the DTC status, other stored Diagnostic Trouble Codes (DTCs) and their status will be listed.

- Read the DTC status. Check the status of the relevant Diagnostic Trouble Code (DTC).

Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as permanent?
Yes - Continue below.
No - Signal Too High - Intermittent Fault


Checking wiring and connectors



Check signal cable between control module # A22 (# A22) and Mass Air Flow (MAF) sensor terminal 2 for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Permanent Fault

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 mass air flow (MAF) sensor, Mass Air Flow (MAF) Sensor, Replacing
- For information about signals, Pinout Values and Diagnostic Parameters


Verification



Hint:After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components.
- Start the engine and let it idle.
- Read the Mass Air Flow (MAF) sensor signal. The Mass Air Flow (MAF) sensor signal should be approximately 1.35V at idling speed.

Is the mass air flow (MAF) sensor signal OK?
Yes - Testing Complete
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed. Exit fault tracing for this diagnostic trouble code (DTC) or make another attempt.