Hombre XS Space Cab L4-2.2L CPC (1997)
Number(s) below refer to number(s) on the diagnostic table.
1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on
the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the
scan tool for later reference.
3. The PCM will only energize the A/C relay when the engine is running. This test will determine if the relay or control circuit is malfunctioning.
4. By disconnecting the relay, the system can be divided into two sections.
If the clutch does not disengage, the malfunction lies on the compressor side of the system.
6. A test light that does not illuminate indicates that the A/C compressor clutch relay is malfunctioning.
8. Determines if the system is normal or if the A/C refrigerant pressure sensor reading is out of range.
9. Determines if the signal is reaching the PCM from the A/C control panel.
The signal should only be present when an A/C mode or defrost mode has been selected.
21. This step determines if the A/C refrigerant pressure sensor is out of range causing the A/C compressor clutch to be disabled or if the A/C charge is
to low to allow A/C operation.
22. Replacement PCMs must be reprogrammed and the crankshaft position system variation procedure must be performed.
23. Connecting circuit's 59 and 459 together bypasses the PCMs control of the A/C compressor clutch.
An A/C compressor clutch that fails to engage at this point indicates that the malfunction is in circuit 59, the compressor coil or compressor coil
ground circuit.
24. With the engine running and the A/C relay commanded ON, the PCM should ground the A/C relay control circuit. This will also illuminate the
test light.
36. If no malfunctions have been found at this point, refer to Diagnostic Aids for additional checks and information.
