Signal Too Low

Signal too low

Checking the status




- Engine idling
- A/C on.
Check whether the fault is permanent or intermittent. Read off the signal from the air conditioning (A/C) pressure sensor.
Check that the signal is within its permitted range and that the pressure increases in the air conditioning (A/C) system when the air conditioning (A/C) compressor engages.
The fault is permanent if the signal is incorrect. The fault is intermittent if the signal is correct.









Continue - Checking the component and wiring

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Checking the component and wiring
Check the cable between engine control module (ECM) terminal #B51 (#C51) and air conditioning (A/C) pressure sensor terminal #2. Check for a short-circuit to ground. Check for an open-circuit.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Location of components, engine compartment Locations
- Checking wiring and terminals Checking Wiring And Terminals













Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Start the engine
- Read off the air conditioning (A/C) pressure
- A/C on
- Blower fan on.
Check that the pressure increases in the air conditioning (A/C) system when the air conditioning (A/C) compressor engages. Also check that cold air blows out of the blower when at the coolest setting.









Is the function within its permitted range?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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Fault-tracing information

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the status

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