Circuit Description
The Speed dependent Steering System (Magnasteer®) incorporates its controller into the EBTCM. The EBTCM controls the amount of current supplied to the Magnasteer® actuator based on input from the wheel speed sensors.
Magnasteer® 2 also uses inputs from the wheel speed sensors along with added input from the Steering Wheel Position Sensor.
Conditions for Setting the DTC
One or both of the Magnasteer® actuator circuit wires become open or shorted.
Action Taken When the DTC Sets
A malfunction DTC is stored. No ABS or Car Icon (TCS indicator) indicators are turned on but Magnasteer® is disabled. ABS/TCS remains functional.
Conditions for Clearing the DTC
| • | Condition for DTC is no longer present and scan tool clear DTC function is used. |
| • | Fifty ignition cycles have passed with no DTC(s) detected. |
Diagnostic Aids
| • | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction. |
| • | An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation. |
| • | If an intermittent malfunction exists refer to Testing for Electrical Intermittents |
Test Description
The numbers below refer to step numbers on the diagnostic table.
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Checks for an open in the Magnasteer® actuator or Magnasteer® CKT.
-
Checks for a short to ground in the Magnasteer® actuator or Magnasteer® CKT.
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Checks for a short to voltage in the Magnasteer® CKT.
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Checks for a short to voltage in the Magnasteer® CKT.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | ||
2 |
Is physical damage of Actuator evident? | -- | ||
3 | Repair as necessary. Is the repair complete? | -- | -- | |
Is the resistance within the range specified in the value(s) column? | 2-3ohms | |||
5 |
Is the resistance within the range specified in the value(s) column? | 2-3ohms | ||
6 |
Is the resistance within the range specified in the value(s) column? | 0-5ohms | ||
7 | Repair CKT 1787 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
8 |
Is the resistance within the range specified in the value(s) column? | 0-5ohms | ||
9 | Repair CKT 345 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
10 | Malfunction is intermittent. Inspect all connectors and harnesses for damage that may result in an open or high resistance when connected. Refer to Testing for Electrical Intermittents in Wiring Systems. Is the repair complete? | -- | -- | |
11 | Replace the Power Steering Gear. Refer to Steering Gear Replacement in Power Steering System. Is the replacement complete? | -- | -- | |
Using J 39200 DMM, measure the resistance between terminals C and B of J 39700 . Is the resistance within the range specified in the value(s) column? | OL (infinite) | |||
13 |
Is the resistance within the range specified in the value(s) column? | OL (infinite) | ||
14 | Using J 39200 DMM, measure the resistance between terminals F and B of J 39700 . Is the resistance within the range specified in the value(s) column? | OL (infinite) | ||
15 | Repair CKT 345 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
16 | Using J 39200 DMM, measure the resistance between terminals C and B of J 39700 . Is the resistance within the range specified in the value(s) column? | OL (infinite) | ||
17 | Malfunction is intermittent. Inspect all connectors and harnesses for damage that may result in a short to ground when connected. Refer to Testing for Electrical Intermittents in Wiring Systems. Is the repair complete? | -- | -- | |
18 | Repair CKT 1787 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
Is the voltage within the range specified in the value(s) column? | Above 1V | |||
20 | Repair CKT 345 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
Using J 39200 DMM, measure the voltage at terminal C of J 39700 . Is the voltage within the range specified in the value(s) column? | Above 1V | |||
22 | Repair CKT 1787 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
23 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Is the replacement complete? | -- | -- |
