DTC P0551 - Power Steering Pressure (PSP) Sensor Circuit Range/Performance
NOTE:
For terminal identification, see TERMINAL IDENTIFICATION in SELF-DIAGNOSTICS section. For circuit and wire color identification, see WIRING DIAGRAMS - 2.4L
article.
- Disconnect pressure hose from power steering pump. Connect in-line pressure gauge (MB990662). Ensure power steering fluied has reached 122-140°F (50-60°C). With engine idling, disconnect Power Steering Pressure (PSP) switch connector. Connect an ohmmeter between PSP switch terminals. Go to next step.
- Gradually close shut-off valve on pressure gauge and increase hydraulic pressure. Hydraulic pressure should activate PSP at 213-284 psi and continuity should exist. If continuity exists as specified, go to next step. If continuity does not exist as specified, replace PSP and go to step 4 .
- Gradually open shut-off valve and decrease hydraulic pressure. Hydraulic pressure should deactivate PSP at 114 psi and continuity should not exist. If continuity does not exist as specified, replace PSP and go to next step. If continuity exists as specified, go to next step.
- Check voltage between ground and PSP switch connector terminal No. 1. If battery voltage exists, check PSP switch connector. If PSP switch connector is okay, replace PCM. If battery voltage does not exist, check PCM connector, PSP switch connector and wiring harness between PCM and PSP switch. If connectors and wiring are okay, replace PCM.