Part 2
Incorrect gear ratio (Continued)
Checking transmission speed sensor resistance
- Ignition off.
- Disconnect control module.
Connect an ohmmeter between #1 (#A1) and #2 (#A2) on the breakout box.
The ohmmeter should read approx. 300-600 ohms.
OK - Checking for sources of interference
Not OK - Checking the transmission connector
-------------------------------------------------
Checking for sources of interference
Check that the transmission speed sensor wiring is not too near sources of interference, such as electric motors, ignition cables, mobile telephone cables etc.
Select "Continue" when the fault has been repaired.
Continue - Test driving
-------------------------------------------------
Checking the transmission connector
- Ignition off.
- Control module disconnected.
- Disconnect the transmission connector.
- Check 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 transmission connector.
Connect an ohmmeter between #1 (#A1) and #2 (#A2) on the breakout box.
The ohmmeter should read approx. 300-600 ohms.
OK - Fault-tracing information
Not OK - Replacing component
-------------------------------------------------
Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the transmission connector.
Continue - Verification
-------------------------------------------------
Replacing component
- Ignition off.
Try a new transmission speed sensor according to Replacing transmission speed sensor Replacing Transmission Speed Sensor.
Select "Continue" when the fault has been repaired.
Continue - Verification
-------------------------------------------------
Checking transmission speed sensor signal cable (-)
- Ignition off.
- Disconnect control module.
Connect an ohmmeter between #12 (#A12) and #20 (#A20) on the breakout box.
The ohmmeter should read infinite resistance.
OK - Checking signal from transmission speed sensor
Not OK - Checking transmission speed sensor
-------------------------------------------------
Checking transmission speed sensor
- Ignition off.
- Disconnect transmission speed sensor.
Connect an ohmmeter between transmission speed sensor connector terminal 2 (transmission speed sensor side) and ground.
The ohmmeter should read infinite resistance.
OK - Checking for a short-circuit
Not OK - Replacing component
-------------------------------------------------
Checking for a short-circuit
Check cable between transmission speed sensor connector terminal 2 and transmission control module (TCM) terminal #A12 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select "Continue" when the fault has been repaired.
Continue - Verification
-------------------------------------------------
Replacing component
- Ignition off.
Try a new transmission speed sensor according to
Select "Continue" when the fault has been repaired.
Continue - Verification
-------------------------------------------------
Checking signal from transmission speed sensor
- Ignition off.
- Connect control module.
- Ignition on.
- Raise car so that front wheels can rotate freely.
- Connect a multimeter (frequency meter) between #11 (#A11) and #12 (#A12) on the breakout box.
- Engine idling.
- Move the gear selector to position D so the front wheels start to rotate
- Increase the engine speed (RPM) to approx. 2,000 rpm and keep it 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 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 resistance in solenoid S1 and S2 circuits
No - Checking vehicle speed sensor (VSS) resistance
-------------------------------------------------
Checking vehicle speed sensor (VSS) resistance
- Ignition off.
- Disconnect control module.
Connect an ohmmeter between #11 (#A11) and #12 (#A12) on the breakout box.
The ohmmeter should read approx. 300-600 ohms.
OK - Checking for sources of interference
Not OK - Checking transmission speed sensor connector
-------------------------------------------------
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.
Select "Continue" when the fault has been repaired.
Continue - Test driving
-------------------------------------------------
Checking transmission speed sensor connector
- Ignition off.
- Check 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 transmission speed sensor connector.
Connect an ohmmeter between #11 (#A11) and #12 (#A12) on the breakout box.
The ohmmeter should read approx. 300-600 ohms.
OK - Fault-tracing information
Not OK - Replacing component
-------------------------------------------------
Fault-tracing information
The cause of the diagnostic trouble code (DTC) has been loose connections in the transmission speed sensor connector.
Continue - Verification
-------------------------------------------------
Replacing component
- Ignition off.
Try a new transmission speed sensor according to
Select "Continue" when the fault has been repaired.
Continue - Verification
-------------------------------------------------
Checking resistance in solenoid S1 and S2 circuits
- Ignition off.
- Disconnect control module.
Connect an ohmmeter between the breakout box terminals:
- #27 (#A27) and #20 (#A20), solenoid S1
- #28 (#A28) and #20 (#A20), solenoid S2
The ohmmeter should read approx. 10-15 ohms.
OK - Checking gear-shift position sensor signal C
Not OK - Checking for contact resistance and oxidation
-------------------------------------------------
Checking for contact resistance and oxidation
- Ignition off.
Check transmission connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Test driving
-------------------------------------------------
Checking gear-shift position sensor signal C
- Ignition off.
- Connect control module.
- Ignition on.
- Move gear selector to position D
Connect a voltmeter between #5 (#A5) and #20 (#A20) on the breakout box.
The voltmeter should read 0-0.5 V.
Twist the gear position sensor lever/shaft up, down and to the side.
The voltage reading on the voltmeter should be constant.
OK - Test driving
Not OK - Checking gear-shift position sensor
-------------------------------------------------
Checking gear-shift position sensor
- Ignition off.
Check gear-shift position sensor adjustment according to Checking/adjusting gear-shift position sensor Adjustments.
Is adjustment OK?
Yes - Replacing component
No - Adjusting gear-shift position sensor
-------------------------------------------------
Replacing component
- Ignition off.
Try a new gear-shift position sensor according to
Select "Continue" when the fault has been repaired.
Continue - Test driving
-------------------------------------------------
Adjusting gear-shift position sensor
- Ignition off.
Adjust gear-shift position sensor according to Checking/adjusting gear-shift position sensor Adjustments.
Select "Continue" when the fault has been repaired.
Continue - Test driving
-------------------------------------------------
Test driving
- Ignition on.
- Erase diagnostic trouble codes (DTCs).
Test drive car. Repeat the driving conditions when the diagnostic trouble code (DTC) was stored. Watch the automatic transmission warning light. If the warning lamp starts flashing a diagnostic trouble code (DTC) has been stored. Make an immediate note of abnormalities in the operation of the transmission before and after the warning lamp started flashing.
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.
Does the diagnostic trouble code (DTC) recur and/or does the transmission exhibit mechanical faults?
Yes - Replacing component
No - Fault-tracing information
-------------------------------------------------
Replacing component
- Ignition off.
Try a new transmission:
- For gasoline engines see Gearbox/torque converter, replacing Gearbox/Torque Converter, Replacing.
- For diesel engines see.
Select "Continue" when the fault has been repaired.
Continue - Verification
-------------------------------------------------
Fault-tracing information
Transmission is OK.
Continue - FAULT FOUND
-------------------------------------------------
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows.
- Ignition off.
- Reconnect connectors, reinstall components.
- Ignition on.
- Erase diagnostic trouble codes (DTCs).
Test drive car. Repeat the driving conditions when the diagnostic trouble code (DTC) was stored. Watch the automatic transmission warning light. If the warning lamp starts flashing a diagnostic trouble code (DTC) has been stored. Make an immediate note of abnormalities in the operation of the transmission before and after the warning lamp started flashing.
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.
Continue - Verification, continued
------------------------
Verification, continued
- Ignition on.
- Read off diagnostic trouble codes (DTCs).
The diagnostic trouble code (DTC) should not recur and the transmission should not exhibit mechanical faults.
OK - VERIFIED
Not OK - VERIFICATION FAILED
------------------------
VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
-------------------------------------------------
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
------------------------
Attempt New Test - Checking transmission oil level
-------------------------------------------------