Signal Too Low. Intermittent Fault

Signal too low. Intermittent fault

Checking wiring
Check the engine control module (ECM) and atmospheric pressure sensor connectors for contact resistance and oxidation according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Check in particular for damage, or loose terminal pins.
Check the signal cable between engine control module (ECM) terminal 18 and atmospheric pressure sensor terminal 3 for an intermittent short-circuit to ground. Remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults and for an intermittent open-circuit according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
Check the voltage cable between engine control module (ECM) connector terminal 78 and atmospheric pressure sensor terminal 1 for an intermittent open-circuit. Remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults.
The supply voltage should be 5 V.

Other information:
- To connect the breakout box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000
- To replace the atmospheric pressure sensor, see Replacing the air conditioning (A/C) system pressure sensor Replacing The Air Conditioning (A/C) System Pressure Sensor.













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Continue - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).

Do you want to view the information again?

Yes - Attempt New Test

No - FAULT FOUND

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Attempt New Test - Checking wiring

FAULT FOUND - DONE

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