Circuit Description
When the ignition is turned ON, the electronic control module (ECM) applies ground to the fuel pump relay coil side. The ECM will apply this ground for 2 seconds or until reference pulses are received by the ECM from the crankshaft position sensor. This activates the fuel pump relay, applying battery voltage to the fuel pump.
Conditions for Setting the DTC
The fuel pump relay circuit is shorted to ground for at least 1.6 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 fuel pump relay connector terminal 85 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 | Perform the Diagnostic System Check. Is the Diagnostic System Check complete? | -- | 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 fuel pump 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 | -- |
