Power Steering Pressure Switch: Testing and Inspection

INSPECTION

1. Turn ignition switch off. Install test harness between the Programmed Fuel Injection Electronic Control Module (PGM-FI ECM) and the harness connector. Turn ignition switch on.

PGM-FI ECM Connector Description And Wire Location:

2. Measure voltage between terminal B8 (+) and A26 (-). Voltage should read less than 1.0 volt. If not, disconnect the two pin connector at the PSP switch. Jump the two terminals together at the connector.
^ If there is more than 1.0 volt, inspect for opens in RED/GREEN (+) wire and/or BLACK (-) wire.
^ If there is less than 1.0 volt, replace the Power Steering Pressure (PSP) switch.
3. Start the engine. turn the steering wheel slowly. Measure the voltage between terminal B8 (+) and terminal A26 (-) while steering wheel is turning. Voltage should read battery voltage. If not, disconnect the two pin connector at the PSP switch and measure the voltage between terminal B8 (+) and terminal A26 (-).
^ If voltage measures battery voltage, replace the PSP switch.
^ If voltage measures less than 1.0 volt, inspect for short in RED/GREEN (+) wire between PGM-FI ECM and PSP switch and/or substitute known good PGM-FI ECM and retest.