Codes 52 & 62 - Idle Tracking Switch
- Ensure throttle was off fast idle cam and contacting Idle Tracking Switch (ITS) during "Functional Test" when code was observed.
- Check switch contacts. Switch should be open when throttle is closed, and continuity should be present when throttle is partially open. If switch is okay, go to next step. If not, go to step 5).
- Check continuity between MCU connector pin 6 and switch, then pin 14 and switch. Be sure wire between pin 6 and switch is not shorted to ground. If wiring is okay, go to next step. If not, repair circuit.
- Be sure ignition is off, then disconnect wiring connectors from MCU and ITS. Measure resistance between pins 6 and 20 in MCU connector. If not within 280-380 ohm range, replace resistor. If resistance is correct, replace MCU module.
- Be sure ignition is off, then disconnect wiring connectors from MCU and ITS. Measure resistance between pins 6 and 20 in MCU connector. If not within 280-380 ohm range, replace resistor and ITS. If within range, replace only ITS. Repeat "Functional Test".