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DIAGNOSIS & TESTING Diagnostic Help 1. Confirm that the malfunction is current and carry-out the diagnostic tests and repair procedures. 2. If the DTC cannot be deleted, it is a current fault. 3. Use a digital multimeter to perform voltage readings on the transaxle electronic system. 4. The scan tool connects to the Data Link Connector (DLC) and communicates with the Transaxle Control Module (TCM) over the CAN data circuit. 5. If the failure is intermittent, perform the following: • Check for loose connectors. • Look for any chafed, pierced, pinched, or partially broken wires. • Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. • Look for the data to change or for the DTC to reset during the wiggle test. • Look for broken, bent, pushed out or corroded terminals. • Inspect the sensor and mounting area for any condition that would result in an incorrect signal, such as damage or foreign material. 6. Remove the TCM from the troubled vehicle and install in a new vehicle and test. If the DTC cannot be deleted, the TCM is malfunctioning. If the DTC can be deleted, return the TCM to the original vehicle. Diagnostic Tools Diagnostic Scan Tool X-431 Read the following when connecting the X-431 scan tool: • Connect the scan tool to the Data Link Connector (DLC) for communication with the vehicle. • The DLC is located on the driver side compartment under the steering column (it is attached to the instrument panel and accessible from the driver seat). • The DLC is rectangular in design and capable of accommodating up to 16 terminals. • The electrical connector has keying features to allow easy connection. TCM Electrical Harness Test Tool If using a TCM electrical harness test tool, you can diagnose the TCM harness while the TCM is still connected. • Measure sensor and solenoid resistance (always measure resistance with the power off). • Measure the signal voltage of the TCM (always measure voltage with the power on). NOTE :
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