Diagnostic Procedure
- Disconnect fuel pump assembly harness connector. Access cover is located under rear seat. Turn ignition on. Measure voltage between ground and fuel pump assembly harness connector terminal No. 4 (Pink/Black wire). See Figure . If voltage is about 5 volts, go to step 3 . If voltage is not about 5 volts, go to next step.
- Check the following:
- Check for poor connection at White, 18-pin connector M6 terminal No. 1 (Pink/Black wire). See Fig 1 . Connector M6 is located under left side of instrument panel. See Figure or Figure .
- Check for poor connection at White, 20-pin connector M81 terminal No. 13 (Pink/Black wire). See Fig 2 . Connector M81 is located near ECM. See Figure or Figure .
- Check for open or short between fuel pump assembly and ECM.
Repair as necessary.
- Turn ignition off. Check continuity between body ground and fuel pump assembly harness connector terminal No. 5 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair as necessary. If problem is not found, go to next step.
- Remove fuel pump assembly. Measure resistance between fuel pump assembly connector terminals No. 4 and 5, with FTT sensor submerged in heated water. See Figure . Resistance should be within acceptable range shown in illustration. See Figure . If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
- No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.