DTC P1650: Power Steering Pressure (PSP) Switch: Condition

DTC P1650 indicates PSP signal is out of self-test range. Possible causes for this fault are as follows:

Verify Electrical Function

Start engine and allow to idle. Using scan tool, access PSP PID (if scan tool cannot access PSP PID, go to next step). Turn steering wheel left, then right. If scan tool does not indicate on/off switching, go to next step. If scan tool indicates on/off switching, ensure all applicable connections are clean and tight, and go to DIAGNOSTIC TEST Z (INTERMITTENT) .

Check PSP Switch Operation

Turn ignition off. Install tachometer. Start engine and allow to idle. Disconnect PSP switch. If engine speed increases when switch is disconnected, replace switch and repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article. If engine speed does not increase when switch is disconnected, go to next step.

Check PSP Circuit Resistance

Turn ignition off. Leave PSP switch disconnected. Turn ignition off. Disconnect 104-pin PCM connector. Inspect connector for damage and repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 31 (PSP) at breakout box and PSP terminal of PSP switch connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open circuit and repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article.

Check For Short In PSP Circuit

Leave ignition off and PSP switch disconnected. Measure resistance between test pins No. 31 (PSP) and 91 at breakout box. Measure resistance between test pin No. 31 and chassis ground. If both resistance measurements are 10 k/ohms or more, go to next step. If resistance is less than 10 k/ohms, repair short circuit and repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article.

Check Switch Resistance

Turn ignition off. Start engine and allow to idle. Disconnect PSP switch. Measure resistance between PSP switch signal and chassis ground while turning steering wheel. If resistance is less than 10 ohms, replace PCM and repeat QUICK TEST. See TESTS W/CODES - INTRODUCTION article. If resistance is 10 ohms or more, replace PSP switch and repeat QUICK TEST.