Engine Controls - MIL ON/Throttle Valve DTC's Stored

01 12 14

April 27, 2012

2018652 Supersedes T.B. V010904 dated February 18, 2009 to update the warranty table.





Vehicle Information

Condition

MIL ON, DTCs P1545, P0121, P0123, P0221 or P0222 Stored in ECM Fault Memory

Malfunction indicator lamp in instrument cluster is illuminated.





A number of incident memory entries with regard to the throttle valve are stored in the ECM. In most cases, the entries are sporadic.

Technical Background

Contact resistance in the ECM wiring - throttle valve.

Production Solution

Optimized wiring and contacts.

Service

Wiring Harness and Connector Repairs, General Information

Tip:
Observe general notes for repairs of vehicle electrical system, see Repair group 97 Wiring in ElsaWeb.

DO NOT solder repairs on vehicle electrical system.

DO NOT repair crimp connectors. If necessary, over lay a wire parallel to inoperative wire.

After crimping a repair connection, crimp connections must be heat-shrunk using hot air gun to prevent moisture penetration.

Yellow wires are to be used exclusively for wiring harness repairs.
Mark repaired areas using yellow adhesive tape.

Yellow wires and areas in wiring harness wrapped with yellow adhesive tape identify a previously performed repair.

Perform a function test after each repair. If necessary, check DTC memory, erase and/or bring systems into basic
setting.

Procedure

^ Switch Ignition OFF.

^ Disconnect battery ground (GND) cable, see Repair Manual Group 27 in ElsaWeb.

WARNING:
The steps above must be completed to ensure safety during repair. Also, observe all country-specific regulations.

Use the applicable repair manual in Elsa in addition to the description below. Check ETKA to determine if you need set 1 or set 2.





- Lengthen wires and preassemble seals according to Figure 1.





- Release lock on new wiring harness end connector housing using small flathead screwdriver. Use slot marked in Figure 2.

- Insert all terminals into housing until they audibly click.

- Reinstall lock.





- Using an appropriate assembly tool, slide the single wire seal up repair wire until it contacts housing. Continue to slide seal into housing as far as the stop (Figure 3).





- Strip wires 6-7mm using tool VAS 1978/3. Install crimp connectors using crimping pliers (base tool) - VAS 1978/1-2 with head VAS 1978/1-1 (Figure 4).

- Remove car harness insulation to appropriate length (approximately 24cm).

- Lay new harness beside old harness. Cut original wires to fit new harness.

- Twist wires 3 and 5 and 1, 2, 4 and 6 as they were originally.

- Crimp connections.

- Use shrink tip (VAS 1978/15) with hot air gun 220 V/ 50 Hz (VAS 1978/14) to complete installation of shrink tubes.

Note:
When heat-shrinking crimp connections, care must be taken not to damage any other wiring, plastic components or insulating material with hot nozzle of heat gun. Always observe operating instructions of heat gun.
- Re-insulate harness with yellow tape.

- Check proper function. If necessary, check DTC memory, erase and/or bring systems into basic setting.

Note:

If faults reoccur after repair, replace main throttle.








Warranty

Required Parts and Tools

Note:
Verify correct housing and associated wire set in ETKA with specific VIN.

Additional Information

All part and service references provided in this Technical Bulletin are subject to change and/or removal.
Always check with your Parts Dept. and Repair Manuals for the latest information.