Circuit Description
When the A/C switch is turned ON, the electronic control module (ECM) grounds the A/C compressor relay to initiate A/C compressor operation. Under various operating conditions, the ECM will interrupt A/C compressor operation.
Conditions for Setting the DTC
A short to battery voltage condition exists and is present for more than 2 seconds.
Diagnostic Aids
| • | Inspect the ECM wiring harness connectors for improper mating, broken locks, improperly formed or damaged terminals, a poor terminal-to-wire connection, and a damaged harness. |
| • | If the connections and the wiring harness are in good condition, connect a test light between the A/C compressor relay connector terminal 86 and ground while moving related connectors. If the fault is induced, the test light will turn ON. This may help to isolate the location of an intermittent problem. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Determine whether the Diagnostic System Check has been performed. Was the Diagnostic System Check performed? | -- | Go to Step 2 | |
2 |
Does the resistance measure near the value specified? | 0 ohms | Go to Step 6 | Go to Step 3 |
3 | Connect a test light between the A/C compressor relay connector terminal 85 and ground. Is the test light ON? | -- | Go to Step 4 | Go to Diagnostic Aids |
4 | Disconnect the engine control module (ECM) connector. Is the test light ON? | -- | Go to Step 5 | Go to Step 7 |
5 |
Is the repair complete? | -- | System OK | -- |
6 |
Is the repair complete? | -- | System OK | -- |
7 |
Is the repair complete? | -- | System OK | -- |
