Manual Road Test Procedure

This procedure will determine whether a problem lies in the electronic control system or the transmission itself. This test should always be performed to distinguish a failure in the electronic control system from an internal transmission failure.





This test checks the gears being used in L, 2 or D range with the shift solenoids disconnected from the Powertrain Control Module (PCM).

Before proceeding with this test, perform the Powertrain On-Board Diagnostic (OBD) System Check in DRIVEABILITY AND EMISSIONS.
1. Start engine and warm to normal operating temperature.
2. Turn ignition switch to LOCK.
3. Disconnect the solenoid wire harness connector from the solenoid wire harness.
4. Start engine.
5. On a level road, move gear selector to Low (L) position and accelerate the vehicle to 20 (13 mph). Observe that 1st gear is being used.
6. Move gear selector to Second (2) position at 20 km/h (13 mph) and accelerate to 40 km/h (25 mph). Observe that the transmission is in 3rd gear.
7. At 40 km/h (25 mph) shift manual selector to Drive (D) position and observe the transmission is in 4th gear at speeds above 40 km/h (25 mph).
8. Stop the vehicle, shift to Park (P) position and turn ignition switch to LOCK.
9. Reconnect solenoid wire harness connector.
10. Turn ignition switch to ON.
11. Clear DTCs with scan tool.

Evaluation:
Compare the results of this MANUAL ROAD TEST PROCEDURE with the Road Test procedure described previously.

If the transmission operates normally with the electronic control system disabled, but malfunctions with the electronic control system connected, the problem lies in the electronic control system. Refer to the ELECTRICAL DIAGNOSIS.





If the transmission is still malfunctioning with the electronic control system disabled, the problem lies in the transmission. Refer to the MANUAL ROAD TEST DIAGNOSIS table. For additional diagnosis information, refer to HYDRAULIC/MECHANICAL DIAGNOSIS.