Tech Tip: MIL Illumination with a Hex Code $3A Set

Tech Tip: MIL Illumination with a Hex Code $3A Set

This bulletin applies to 1995-1997 (FJ) Chrysler Avenger/Sebring/Talon vehicles with 2.0L naturally aspirated engines. The repair involves replacing the intake air temperature sensor connector assembly.

Models: 1995-’97 (FJ) Chrysler Avenger/Sebring/Talon
Note: This bulletin applies to vehicles with 2.0L naturally aspirated engines.

Symptom/Condition: MIL illumination with DTC intake air temp sensor voltage high – Hex code $3A.

Diagnosis
Using the Mopar Diagnostic System (MDS) or a diagnostic scan tool (DRB III) with the appropriate diagnostic procedures manual, verify all engine systems are functioning as designed. If DTCs are present, record them on the repair order and repair as necessary before proceeding further with this bulletin. If no DTCs other than the one listed above are present, check the intake air temperature connector and wiring as follows:
1. Locate the intake air temperature sensor and wiring on the back side of the intake manifold (Figure 1).
2. Inspect the wiring harness and connector for continuity (connector A-57 Talon/A-61 Avenger/ Sebring). Wiggle the harness near the connector to fully check for broken wires. If the harness proves to be good, further investigation will be required. If the wires are broken, perform the Repair Procedure.

Repair Procedure
This repair involves replacing the intake air temperature sensor connector assembly. See Figure 1.
1. Cut the wiring connector from the harness just behind the break.
2. Remove 1” of insulation from the harness wires and connector wires.
3. Slip a piece of heat shrink tubing (P/N 04778570) over one side of each wire. Make sure the tubing is long enough to cover and seal each splice joint.
4. Spread the strands of wire on each end and push the ends together. Make sure to attach the BK/DG wire to terminal 2 (A) and the BR/DB wire to terminal 1(B) (see Figure 2).
5. Twist the wires together on each splice and solder the connections with rosin core solder.
6. Center the heat shrink tubing over each splice and heat the joints with a heat gun until the tubing is tightly sealed and sealant flows from each end of the tubing.
7. Using electrical tape, wrap the wires from below the splice to the connector.
8. Route the harness under the vacuum hose and connect it to the intake air temperature sensor.

Technical service bulletin courtesy of Mitchell 1.

For more information on Mitchell 1 products and services, automotive professionals can log onto the company’s website at www.mitchell1.com.

You May Also Like

Transmissions – CVT

Knowing what the common issues are & understanding the options available to isolate & fix problems are the keys to success.

All transmission models have unique problems that are common to that model; JATCO CVT units are no exception. Technicians are facing an uphill battle when it comes to diagnosing and repairing CVTs if they don’t have the right information on hand. Knowing what the common issues are and understanding the options available to isolate and fix problems are the keys to a successful repair.

Simplifying AWD Systems

No matter the manufacturer, there is almost always an all-wheel drive (AWD) option.

Manual Transmission Service

Parts that wear out must be replaced.

Transmission Fluid Hydraulics

You need to know how transmission fluid flows inside an automatic transmission.

Advanced Wheel Bearing Diagnostics

Can a bump set a wheel speed sensor code?

Other Posts

How Well Do You Know Your Driveshaft?

There are three types of modern driveshafts with multiple configurations.

Transmission Service

The following is an example of a dishonest vehicle and how to go about catching it in its lie.

Limited-Slip Differentials And Diagnostics

A limited-slip differential helps to control the tangential forces.

Seven CV Joint Mistakes You Shouldn’t Make

If a CV joint fails, it rarely fails on its own. Outside factors can damage a joint worse than cutting a boot with a knife.