RENR5042-02 163 Troubleshooting Section Not OK The lamp did not turn on. The lamp circuit is not functioning properly. Proceed to Test Step 5. Test Step 6. Check the ECM A. Remove wire F424-YL from terminal P1-30. Test Step 5. Check the Voltage from the Keyswitch to the Maintenance Due Lamp B. Fabricate a jumper wire 100 mm (4 inches) long. Crimp a Deutsch pin to both ends of the wire. A. Turn the keyswitch to the OFF position. C. Insert one end of the jumper wire into terminal P1-30. B. Remove the wire from the terminal R of the keyswitch. D. Connect one probe of a voltage test lamp to the wire jumper in terminal P1-30. C. Turn the keyswitch to the ON position. E.
Connect the other probe of the voltage test lamp to +Battery. D. Measure the voltage on terminal B of the keyswitch to engine ground. E. Measure the voltage on terminal R of the keyswitch to engine ground. F. Turn the keyswitch to the ON position. Expected Result: F. Turn the keyswitch to the OFF position. The test lamp turns ON for five seconds. Then, the test lamp turns OFF. Expected Result: Voltage is present on terminal B and terminal R at the keyswitch. Results: OK – The ECM is operating correctly. The circuit appears to be operating correctly. Results: Repair: The problem may be intermittent.
If the problem is intermittent, refer to the diagnostic functional test Troubleshooting, “Electrical Connectors - Inspect”. OK – Voltage is present on terminal B and terminal R at the keyswitch. Repair: If voltage is present on terminal R, repair the wire between the keyswitch and the maintenance due lamp. Verify that the breaker is not tripped. Return all wiring to the original configuration. Verify that the problem is eliminated. STOP. Not OK – The ECM is not sinking the current. Repair: Temporarily connect a test ECM. Check the operation of the maintenance due lamp when the test ECM is installed. If the problem is resolved with the test ECM, then reconnect the suspect ECM.
If the problem returns with the suspect ECM, replace the ECM. STOP. Not OK – Voltage is not present on terminal B at the keyswitch. Repair: If voltage is not present on terminal B, repair the wire between the +Battery and the keyswitch. Verify that the breaker is not tripped. Check the battery’s no-load voltage. Return all wiring to the original configuration. Verify that the problem is eliminated. STOP. i02290038 PTO Switch Circuit - Test STOP. SMCS Code: 7332-038 Not OK – Voltage is not present on terminal R at the keyswitch. System Operation Description: Repair: If voltage is present on terminal B of the keyswitch but not present on terminal R, replace the keyswitch.
Return all wiring to the original configuration. Verify that the problem is eliminated. Use this procedure to troubleshoot any suspect problems with the circuits for the power take-off controls (PTO). The PTO controls provide an alternative method of controlling the desired engine speed. STOP. The Electronic Control Module (ECM) provides the PTO speed control function. The PTO speed control function requires the following inputs: