Part 2
Incorrect gear ratio (Continued)
Checking the transmission connector
- Ignition off
- Control module disconnected.
- Disconnect the black 2-pin transmission connector
- Check the black 2-pin transmission control module (TCM) connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault
- Connect the transmission connector.
Connect an ohmmeter between:
- terminals #39 and #25 on the breakout box.
The ohmmeter should read 300-600 ohms.
OK - Fault-tracing information
Not OK - Replacing the component
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Fault-tracing information
The cause of the diagnostic trouble code (DTC) was loose connections in the transmission connector.
Continue - Verification
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Replacing the component
- Ignition off.
Try a new transmission speed sensor according to Replacing the engine speed (RPM) sensor Service and Repair.
Continue - Verification
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Checking the transmission speed sensor signal cable (-)
- Ignition off
- Disconnect the control module.
Connect an ohmmeter between:
- terminals #24 and #1 on the breakout box.
The ohmmeter should read infinite resistance.
OK - Checking the signal from the transmission speed sensor
Not OK - Checking the transmission speed sensor
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Checking the transmission speed sensor
- Ignition off
- Disconnect the transmission speed sensor.
Connect an ohmmeter between the white 2-pin vehicle speed sensor (VSS) connector terminal #1 (vehicle speed sensor (VSS) side) and ground.
The ohmmeter should read infinite resistance.
OK - Checking for a short-circuit
Not OK - Replacing the component
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Checking for a short-circuit
Check the cable between the vehicle speed sensor (VSS) connector:
- terminal #1 and control module terminal #24.
for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Continue - Verification
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Checking the signal from the transmission speed sensor
- Ignition off
- Connect the control module.
- Ignition on
- Raise the car so that the front wheels can rotate freely
- Connect a frequency meter between terminals #11 and #24 on the breakout box
- Engine idling
- Shift the gear selector to position D so the front wheels start to rotate
- Increase the engine speed (RPM) to approximately 2000 rpm. Keep the engine speed steady.
Note! When the rear wheels are stationary and the front wheels rotate, diagnostic trouble codes (DTCs) may be stored in the ABS system. Erase any diagnostic trouble codes (DTCs) stored in the ABS system after fault-tracing.
The multimeter (frequency meter) should give a stable reading (Hz) when the speed is steady.
Note! Ensure that the front wheels are not rotating when the gear selector is moved.
Is the frequency stable?
Yes - Checking the resistance in solenoid S1 and S2 circuits
No - Checking the vehicle speed sensor (VSS) resistance
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Checking the vehicle speed sensor (VSS) resistance
- Ignition off
- Disconnect the control module.
Connect an ohmmeter between:
- terminals #11 and #24 on the breakout box.
The ohmmeter should read 300-600 ohms.
OK - Checking for sources of interference
Not OK - Checking the transmission speed sensor connector
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Checking for sources of interference
Check that the transmission speed sensor cables are not too near sources of interference, such as electric motors, ignition cables, mobile telephone cables etc. and that the transmission speed sensor is not loose.
Continue - Test driving
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Checking the transmission speed sensor connector
- Ignition off
- Check the transmission speed sensor connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault
- Connect the transmission speed sensor connector.
Connect an ohmmeter between:
- Terminals #11 and #24 on the breakout box.
The ohmmeter should read 300-600 ohms.
OK - Fault-tracing information
Not OK - Replacing the component
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Fault-tracing information
The cause of the diagnostic trouble code (DTC) was loose connections in the transmission speed sensor connector.
Continue - Verification
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Replacing the component
- Ignition off.
Try a new transmission speed sensor according to Replacing the speed sensor .
Continue - Verification
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Checking the resistance in solenoid S1 and S2 circuits
- Ignition off
- Disconnect the control module.
Connect an ohmmeter between the breakout box terminals:
- #17 and #1, solenoid S1
- #31 and #1, solenoid S2.
The ohmmeter should read 12-18 ohms.
OK - Checking the control module
Not OK - Checking for contact resistance and oxidation
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Checking for contact resistance and oxidation
Check the transmission connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Continue - Test driving
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Checking the control module
- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Erase the diagnostic trouble codes (DTCs).
Test drive the car. When test driving the car the oil temperature should be above +20°C and the throttle opening greater than 5 %.
Gear selector in position L, speed approximately 30 km/h (1st gear). Drive with constant throttle position (engine speed (RPM) over 1,400rpm).
- Stop the car.
Continue - Checking the control module (continued)
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Checking the control module (continued)
Check to see if the diagnostic trouble code (DTC) has been stored again.
Has the diagnostic trouble code (DTC) been stored again?
Yes - Replacing the component
No - Test driving
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Replacing the component
- Ignition off.
Try a new control module according to Replacing the transmission control module (TCM) .
Continue - Checking the component
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Test driving
- Ignition on
- Erase diagnostic trouble codes (DTCs).
Test-drive the car as described in Test Drive Form, description Test Drive Form, Description. Recreate the driving conditions that prevailed when the diagnostic trouble code was set. Monitor the automatic transmission warning lamp. If the warning lamp begins to flash, a diagnostic trouble code has been stored. Make an immediate note of any abnormalities in transmission function and operation before and after the warning lamp begins to flash.
Note! Once the diagnostic trouble code has been set permanently, activate the "Limp Home" program. The transmission is not, therefore, functioning normally.
Is the transmission exhibiting any obvious mechanical malfunctions or making a noise?
Yes - Replacing the component
No - Fault-tracing information
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Checking the component
- Ignition on
- Erase the diagnostic trouble codes (DTCs).
Test drive the car. When test driving the car the oil temperature should be above +20°C and the throttle opening greater than 5 %.
Gear selector in position L, speed approximately 30 km/h (1st gear). Drive with constant throttle position (engine speed (RPM) over 1,400 rpm).
- Stop the car.
Continue - Checking the component (continued)
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Checking the component (continued)
Check to see if the diagnostic trouble code (DTC) has been stored again.
Has the diagnostic trouble code (DTC) been stored again?
Yes - Replacing the component
No - Fault-tracing information
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Replacing the component
- Ignition off.
Try a new transmission according to Replacing the transmission Replacing The Transmission.
Continue - Verification
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Fault-tracing information
Transmission is OK.
Continue - FAULT FOUND
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Fault-tracing information
Old control module was defective.
Continue - FAULT FOUND
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Verification
Verification
Hint: After repairs have been completed they must be verified as follows to ensure that the fault has been eliminated:
- Ignition off.
- Reconnect connectors, reinstall components.
- Ignition on.
- Erase diagnostic trouble codes (DTCs).
Test drive the car. When test driving the car the oil temperature should be over +20°C and the throttle opening more than 5%.
Gear selector in position L, speed approx. 30 km/h (1st gear). Accelerate evenly (engine speed (RPM) over 1,400 rpm).
Note! If the diagnostic trouble code (DTC) is stored permanently, the transmission control module (TCM) activates the emergency "Limp Home" program. The transmission will not operate normally. See Emergency programs Emergency Programs In The Event Of A Fault for "Limp Home" symptoms.
- Stop car.
Continue - Verification, continued
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Verification, continued
After carrying out a test drive: check to see if the diagnostic trouble code (DTC) has been stored again.
Has the diagnostic trouble code (DTC) been stored again. Is the transmission obviously malfunctioning?
Yes - VERIFICATION FAILED
No - VERIFIED
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VERIFICATION FAILED - Fault-tracing information
VERIFIED - FAULT FOUND
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the transmission oil level
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