Diagnostic Test

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

1) ACTIVE DTC
Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes
1. Go To step 2).
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
2) IAT SENSOR VOLTAGE ABOVE 4.6 VOLTS
Turn the ignition off.

Disconnect the IAT Sensor harness connector.

Ignition on, engine not running.

With a scan tool, read the IAT voltage.

Is the voltage above 4.6 volts?

Yes
1. Go To step 3).
No
1. Go To step 4).
3) IAT SENSOR

Fig 1: Checking Intake Air Temperature Sensor Signal Circuit & Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Connect a jumper wire between the (K21) IAT Signal circuit and the (K900) Sensor ground circuit in the IAT Sensor harness connector.

With a scan tool, read the IAT voltage.

Is the voltage below 1.0 volt with the jumper wire installed?

Yes
1. Replace the IAT Sensor.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 4).
  NOTE: Remove the jumper wire before continuing.
4) (K21) IAT SIGNAL CIRCUIT HIGH RESISTANCE
Turn the ignition off.

Disconnect the C2 PCM harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis.

Using a voltmeter perform a voltage drop test. Backprobe the (K21) IAT Signal circuit at the IAT Sensor harness connector to the appropriate terminal of the special tool #8815. Ensure the voltmeter leads are connected with the circuit's correct polarity.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Start the engine and allow it to reach normal operating temperature.

Monitor the voltmeter.

Is the voltage below 0.5 volts?

Yes
1. Go To step 5).
No
1. Repair the high resistance in the (K21) IAT Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
5) (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE
Turn the ignition off.

Using a voltmeter perform a voltage drop test. Backprobe the (K900) Sensor Ground circuit at the IAT Sensor harness connector to the appropriate terminal of the special tool #8815. Ensure the voltmeter leads are connected with the circuit's correct polarity.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Start the engine and allow it to reach normal operating temperature.

Monitor the voltmeter.

Is the voltage below 0.5 volts?

Yes
1. Go To step 6).
No
1. Repair the open in the (K900) Sensor ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
6) PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .