P0833-CLUTCH UPSTOP SWITCH PERFORMANCE





For a complete wiring diagram Refer to Section 8W



Possible Causes
INTERMITTENT DTC
(T26) CLUTCH UPSTOP SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE
(T26) CLUTCH UPSTOP SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
(T26) CLUTCH UPSTOP SWITCH SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(Z905) GROUND CIRCUIT OPEN OR HIGH RESISTANCE
CLUTCH INTERLOCK SWITCH
ENGINE CONTROL MODULE (ECM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)



Diagnostic Test

1. DTC IS ACTIVE

Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
Press and release the clutch pedal several times.
With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes


No

2. (T26) CLUTCH UPSTOP SWITCH SIGNAL CIRCUIT VOLTAGE



Turn the ignition off.
Disconnect the Clutch Interlock Switch harness connector.
Turn the ignition on.
Measure the voltage of the (T26) Clutch Upstop Switch Signal circuit in the Clutch Interlock Switch harness connector.

Is the voltage above 10.0 volts?

Yes


No

3. (Z905) GROUND CIRCUIT OPEN OR HIGH RESISTANCE



Using a 12 volt test light connected to 12 volts, check the (Z905) Ground circuit between the Clutch Interlock Switch harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.



Is the test light illuminated and bright?

Yes


No

4. CLUTCH INTERLOCK SWITCH

Turn the ignition off.
Connect a jumper wire between the (Z905) Ground circuit and the (T26) Clutch Upstop Switch Signal circuit in the Clutch Interlock Switch harness connector.
Turn the ignition on.
With the scan tool, monitor the Clutch Upstop status.

NOTE: The scan tool should display the Clutch Interlock status as not pressed with the jumper wire in place and pressed with the jumper wire removed.



Does the scan tool display the status as described above?

Yes


No

5. (T26) CLUTCH UPSTOP SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE



Turn the ignition off.
Disconnect the Engine Control Module (ECM) harness connector.
Remove the ASD Relay from the TIPM.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the (T26) Clutch Upstop Switch Signal circuit in the Clutch Interlock Switch harness connector.

Is there any voltage present?

Yes


No

6. (T26) CLUTCH UPSTOP SWITCH SIGNAL CIRCUIT SHORTED TO GROUND



Turn the ignition off.
Measure the resistance between ground and the (T26) Clutch Upstop Switch Signal circuit in the Clutch Interlock Switch harness connector.

Is the resistance above 1000 ohms?

Yes


No

7. (T26) CLUTCH UPSTOP SWITCH SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE



Measure the resistance of the (T26) Clutch Upstop Switch Signal circuit between the Clutch Interlock Switch harness connector and the Engine Control Module (ECM) harness connector.

Is the resistance below 10.0 ohms?

Yes


No

8. ENGINE CONTROL MODULE (ECM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Clutch Interlock Switch and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
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.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes


No