Diagnostic Procedure
WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Loosen and retighten engine ground bolts. See Figure . Disconnect PSP sensor harness connector. See Fig 1 . Turn ignition on. Measure voltage between ground and PSP sensor harness connector terminal No. 1 (Red wire). If voltage is about 5 volts, go to next step. If voltage is not about 5 volts, repair open or short between PSP sensor and ECM.
- Turn ignition off. Check continuity between engine ground and PSP sensor harness connector terminal No. 3 (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, repair open or short between PSP sensor, ECM and transmission control module (on A/T models). If circuit is okay, go to next step.
- Disconnect ECM harness connector. See Figure . Check continuity of Green wire (on I35) or White/Blue wire (on Maxima) between PSP sensor harness connector terminal No. 2 and ECM harness connector terminal No. 89. See Figure . Also, check circuit for short to ground and short to voltage. If problem is found, repair as necessary. If circuit is okay, go to next step.
- Reconnect all harness connectors. Start engine and let it idle. Measure voltage between ground and ECM terminal No. 89 (Red wire) by backprobing. When steering wheel is fully turned, voltage should be about 3.6 volts. When steering wheel is not fully turned, voltage should be about 0.6 volt. If voltage is as specified, go to next step. If voltage is not as specified, replace PSP sensor.
- No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.