B2433

Fault Symptom
TCS OFF lamp on, TCS system inoperative

Condition
- Control module output pin 18 shorted to ground, battery + or pin 35.
- Control module output pin 35 shorted to ground, battery + or pin 18.





Diagnostic Procedure
1. With the ignition switched off, unplug connector H16-2 and check that the engine is not shorted to ground by measuring the resistance across ground and pin 7 of the female connector and also across ground and pin 8 of the female connector.
In both cases the resistance should be infinite (OL).

CAUTION: The throttle motor must never be supplied directly with 12 V.

2. Check the throttle motor electrically and mechanically by connecting it to the car battery in series with the high- beam filament of a 12W 60W bulb (H4). Using a multimeter set for measuring current in the 1 Ohm range, a reading of 3.8 +/- 0.5 A should be obtained. Slowly change the position of the butterfly by hand from open to closed. The meter reading should now vary by a maximum of +/- 0.5 A from the reading first obtained.
Also check that it is noticeably harder to close the butterfly when the throttle motor is supplied with current.
If the above checks out OK, proceed to point 4. If not, continue with point 3.
3. Remove the TCS throttle body
Repeat the checking procedure described in points 1 and 2, but now directly on pins 1 and 5 of the throttle motor.
If the readings obtained are correct, remedy the faulty wiring between the throttle motor and connector H16-2.
If incorrect readings are also obtained here, install a replacement TCS throttle body.
4. With the ignition switched off, plug a BOB into the TCS control module connector (control module not connected).
Check the cable between pin 18 of the control module connector and pin 8 of the male connector (H16-2) for continuity/shorting.
Also check the cable between pin 35 of the control module connector and pin 7 of the male connector for continuity/shorting.
5. Clear the trouble code. Start the car and drive it to check whether the code is generated afresh.
- If it is then see preliminary diagnostic information.