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Power Steering Pressure (PSP) Switch Malfunction

NOTE: The following test procedures are for DTCs P0552, P0553, P1650 and P15651.

Fig 1: Power Steering Pressure (PSP) Switch Malfunction

G03723742

Courtesy of MAZDA MOTORS CORP.

POWER STEERING PRESSURE (PSP) SWITCH MALFUNCTION INSPECTION/ACTION CHART

STEP	INSPECTION		ACTION
1	Was PCM Quick Test performed? NOTE: Steering wheel must not be turned during KOER Self-Test.	Yes	Go to next step.
1		No	Perform PCM Quick Test. See PCM QUICK TEST .
2	VERIFY ELECTRICAL FUNCTION Key ON, Engine Running (KOER). Using WDS or equivalent tester, select Diagnostic Data Link. Select PCM. Select PID/Data Monitor and Record. View PSP PID while turning the steering wheel back and forth. Does PSP PID indicate Low/High or High/Low?	Yes	See TEST 3: INTERMITTENT .
2		No	Go to next step.
3	CHECK FOR PSP SWITCH CYCLING Disconnect PSP switch. Install a jumper wire across the PSP switch harness connector. Key ON, Engine Running (KOER). Record the PSP PID reading. Access PID/Data Monitor and Record. Remove the jumper wire and record the PSP PID reading. Key OFF. Does the PSP PID change from high to low?	Yes	Replace the PSP switch. See POWER STEERING . Go to step 6.
3		No	Go to next step.
4	CHECK CONTINUITY OF PSP CIRCUITS Disconnect PCM. Install Breakout Box, leave PCM disconnected. Measure resistance of PSP circuit between PCM test pin C3 and PSP switch harness connector. Measure resistance of SIG RTN circuit between PCM test pin C41 and the PSP switch harness connector. Is each resistance less than 5.0 ohms?	Yes	Go to next step.
4		No	Repair open circuit. Go to step 6.
5	CHECK PSP CIRCUIT FOR SHORT Measure resistance between PCM test pin C3 (PSP) and PCM test pin C41 (SIG RTN). Measure resistance between test pin C3 (PSP) and chassis ground. Is either resistance less than 10K ohms?	Yes	Repair short in harness. Go to next step.
5		No	Replace PCM. See POWERTRAIN CONTROL MODULE (PCM) . Go to next step.
6	VERIFY TROUBLESHOOTING OF DTCs COMPLETED Make sure to reconnect all disconnected connectors. Clear DTCs from PCM memory using WDS or equivalent tester generic OBD II function. Perform PCM Quick Test. See PCM QUICK TEST . Is same DTC present?	Yes	Replace PCM. See POWERTRAIN CONTROL MODULE (PCM) . Repeat PCM Quick Test. See PCM QUICK TEST .
6		No	If any other DTC is present, go to applicable DTC inspection. If no DTC is present, troubleshooting complete.