Circuit/System Testing
- Ignition OFF, disconnect the IC module connector. Test for less than 5 ohms between the IC module low reference circuit IC module terminal L and ground.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Test for less than 3 ohms between the IC module ground circuit IC module terminal K and battery ground.
- If greater than the specified value, test the ground circuit for an open/high resistance.
- Ignition ON, test for B+ between the IC module ignition voltage circuit IC module terminal P and ground.
- If less than the specified range, test the IC module ignition voltage circuit IC module terminal P for an open/high resistance or short to ground.
- Ignition ON, using a jumper wire connected to B+, momentarily touch the low resolution engine speed signal circuit IC module terminal D at the IC module harness connector repeatedly, while measuring the frequency with a DMM. The frequency should be greater than 0 Hz.
- If the frequency is 0 Hz, test the IC timing control circuit IC module terminal A for an open/high resistance, short to ground, or short to voltage. If the circuit tests OK, test the IC timing signal circuit IC module terminal B for a short to ground. If both circuits test OK, replace the IC module.
- If the frequency is greater than 0 Hz, replace the PCM.
- If all circuits test OK, replace the IC module.