DTC P0704: Clutch Switch Input Circuit: Condition

DTC indicates clutch switch and/or neutral switch malfunction. Possible causes are as follows:

Check CPP/PNP PID

Turn ignition off. Connect scan tool to Data Link Connector (DLC). Ensure shift lever is in Neutral. Turn ignition on. Using scan tool, select CPP/PNP PID. While observing CPP/PNP PID, apply and release clutch pedal. If PID value does not cycle ON and OFF, go to next step. If PID value cycles ON and OFF, check PCM connector for loose, damaged or corroded terminals. Repair as necessary. If connector is okay, replace PCM.

Check Clutch Switch & Neutral Switch

Turn ignition off. Locate clutch switch near clutch pedal and neutral switch near transmission shift linkage. Inspect switches and brackets for damage and repair as necessary. Disconnect switch connectors. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. While depressing clutch pedal, measure resistance between clutch switch terminals. Measure resistance between neutral switch connector terminals. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace suspect switch.

Check Clutch Switch Circuit For Open

Turn ignition off. Disconnect scan tool. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal at clutch switch wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in circuit.

Check Clutch Switch Circuit For Short

Measure resistance between chassis ground and test pin No. 64 at breakout box. Measure resistance between test pins No. 64 and 91 at breakout box. If both resistance readings are greater than 10 k/ohms, replace PCM. If any resistance reading is 10 k/ohms or less, repair short circuit.