Circuit Description
Evaporative canister purge is controlled by the electronic control module (ECM). The ECM applies a ground to the evaporative emission (EVAP) canister purge solenoid. The ECM determines when to activate the EVAP canister purge solenoid depending on operating conditions, including throttle position, engine speed, engine coolant temperature, and ambient temperature.
Conditions for Setting the DTC
| • | A short to battery voltage condition exists and is present for more than 2 seconds. |
| • | The malfunction indicator lamp (MIL) is not ON. |
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 EVAP canister purge solenoid connector terminal 2 and battery positive 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 |
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 | -- |
