Checking wiring
Check the engine control module (ECM) and atmospheric pressure sensor connectors for contact resistance and oxidation according to Contact resistance and oxidation .
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 Short-circuit to ground, intermittent faults and for an intermittent open-circuit according to Open-circuit, 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 Open-circuit, intermittent faults .
The supply voltage should be 5 V.
Other information:
- To connect the breakout box, see Connecting the breakout box. EMS 2000
- To replace the atmospheric pressure sensor, see Replacing the air conditioning (A/C) system pressure sensor .
- Continue
Refer to Information