Illustration 1 | g00733925 |
(1) Retarder lever control |
Illustration 2 | g00762364 |
Schematic Of The Retarder Lever Switch |
Circuit Continuity     | ||||
Retarder Lever Switch (CID 1227)     | ||||
Lever Position     | Connector Contact (2) of the Switch     | Connector Contact (3) of the Switch     | Connector Contact (4) of the Switch     | |
1     | Off     | Open (1)     | Open     | Open     |
2     | Low     | Open     | Open     | Closed (2)     |
3     | Med     | Closed     | Open     | Closed     |
4     | High     | Open     | Closed     | Closed     |
Transmission/Chassis ECM     | ||||
    | Connector Contact (J1-12) of the ECM     | Connector Contact (J1-57) of the ECM     | Connector Contact (J1-56) of the ECM     | Connector Contact (J1-55) of the ECM     |
( 1 ) | Open Circuit |
( 2 ) | Circuit Continuity |
Note: Before performing the following procedure, ensure that the diagnostic code for this procedure is active.
Test Step 1. CHECK THE RETARDER LEVER SWITCH.
- Turn the key start switch and the disconnect switch to the OFF position.
- Disconnect the harness connector of the switch from the machine harness.
- At the harness connector of the switch, check the continuity to the sensor ground of the open contacts of the switch. At the harness connector of the switch, check the continuity. Check the continuity from the ground return contact 6 to all other signal contacts. Activate each position of retarder lever switch. Refer to Table 1.
Expected Result:
The continuity check agrees with Table 1.
Results:
- OK - The resistance that was measured is correct. Proceed to test step 2.
- NOT OK - One or more of the measurements is not correct. The switch has failed.
Repair: Replace the switch.
Stop.
Test Step 2. CHECK FOR AN OPEN IN THE GROUND RETURN CIRCUIT.
- The key start switch and the disconnect switch remain in the OFF position.
- The harness connector of the switch remains disconnected from the machine harness.
- At the machine harness connector for the switch, install a jumper wire from contact 6 (wire J764-BR) to the frame ground.
- At the machine harness connector J1, measure the resistance from contact J1-12 (wire J764-BR) to frame ground.
Expected Result:
The resistance should measure less than 5000 ohms.
Results:
- OK - The resistance measures less than 5000 ohms. The harness is correct. Proceed to test step 3.
- NOT OK - The resistance that is measured is greater than 5000 ohms. There is an open in the harness.
Repair: Repair the harness or replace the harness.
Stop.
Test Step 3. CHECK THE MACHINE HARNESS OF THE SWITCH CIRCUIT.
- The key start switch and the disconnect switch remain in the OFF position.
- Remove the jumper wire from contact 6 (wire J764-BR) to the frame ground.
- Reconnect the harness connector of the switch to the machine harness connector.
- Place the shift lever into position 1.
- Disconnect the machine harness connector J1 from the ECM.
- Measure the resistance from the sensor ground J1-12 to all signal contacts. The signal contacts are contacts: J1-55, J1-56 and J1-57.
Expected Result:
The resistance agrees with the values in table 1.
Results:
- OK - The resistance that is measured is correct for all measurements. Proceed to test step 4.
- NOT OK - The resistance that is measured is NOT correct for one or more of the measurements. The machine harness has failed.
Repair: Replace the machine harness or repair the machine harness.
Stop.
Test Step 4. RECHECK THE MACHINE HARNESS OF THE SWITCH CIRCUIT.
- Place the shift lever into position 2.
- Measure the resistance from the sensor ground J1-12 to all of the signal contacts. The signal contacts are contacts: J1-55, J1-56 and J1-57.
Expected Result:
The resistance agrees with the values in table 1.
Results:
- OK - The resistance that is measured is correct for all measurements. Proceed to test step 5.
- NOT OK - The resistance that is measured is NOT correct for one or more of the measurements. The machine harness has failed.
Repair: Replace the machine harness or repair the machine harness.
Stop.
Test Step 5. RECHECK THE MACHINE HARNESS OF THE SWITCH CIRCUIT.
- Place the shift lever into position 3.
- Measure the resistance from the sensor ground J1-12 to all of the signal contacts. The signal contacts are contacts: J1-55, J1-56 and J1-57.
Expected Result:
The resistance agrees with the values in table 1.
Results:
- OK - The resistance that is measured is correct for all measurements. Proceed to test step 6.
- NOT OK - The resistance that is measured is NOT correct for one or more of the measurements. The machine harness has failed.
Repair: Replace the machine harness or repair the machine harness.
Stop.
Test Step 6. RECHECK THE MACHINE HARNESS OF THE SWITCH CIRCUIT.
- Place the shift lever into position 4.
- Measure the resistance from the sensor ground J1-12 to all of the signal contacts. The signal contacts are contacts: J1-55, J1-56 and J1-57.
Expected Result:
The resistance agrees with the values in table 1.
Results:
- OK - The resistance that is measured is correct for all measurements. Proceed to test step 7.
- NOT OK - The resistance that is measured is NOT correct for one or more of the measurements. The machine harness has failed.
Repair: Replace the machine harness or repair the machine harness.
Stop.
Test Step 7. CHECK IF THE DIAGNOSTIC CODE REMAINS.
- Inspect the contacts and clean the contacts of the harness connectors.
- Reconnect all harness connectors.
- Turn the disconnect switch and the key start switch to the ON position.
- Start the engine and run the engine at low idle.
- View the status of the diagnostic code. The diagnostic code is active or the diagnostic code is NOT active.
Expected Result:
The diagnostic code is still active.
Results:
- YES - The diagnostic code is still active. The ECM has failed.
Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this diagnostic code again. Recheck the status of the diagnostic code. The diagnostic code is active or the diagnostic code is NOT active. Replace the ECM if the cause is not found. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace".
Stop.
- NO - The diagnostic code is NOT present.
Repair: The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection and/or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation.
Stop.