Dodge Ram Truck 1500-2500-3500. Manual — part 1148

P0071-AMBIENT/BATTERY TEMP SENSOR PERFORMANCE (CONTINUED)

5.

RESISTANCE IN THE (K25) BATTERY TEMP SENSOR SIGNAL CIRCUIT

Turn the ignition off.

Connect the Battery Temp Sensor harness connector.

NOTE: Make sure the voltmeter leads meet the terminals in the
connector and that there is good terminal to wire connection.

NOTE: Make sure the voltmeter leads are connected for positive
polarity
Backprobe the (K25) Battery Temp Sensor Signal circuit at the Sensor
harness connector and the PCM harness connector with both voltme-
ter leads.

Start the engine.

Allow the engine to idle.

Is the voltage below 0.10 of a volt?

Yes

>> Go To 6

No

>> Repair the excessive resistance in the (K25) Battery Temp

Sensor Signal circuit.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

6.

RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT

Turn the ignition off.

NOTE: Make sure the voltmeter leads meet the terminals in the
connector and that there is good terminal to wire connection.

NOTE: Make sure the voltmeter leads are connected for positive
polarity
Backprobe the (K900) Sensor ground circuit at the Battery Tempera-
ture Sensor harness connector and the PCM harness connector using
both volt meter leads.

Start the engine.

Allow the engine to idle.

Is the voltage below 0.10 of a volt?

Yes

>> Go To 8

No

>> Repair the excessive resistance in the (K900) Sensor

ground circuit.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0071-AMBIENT/BATTERY TEMP SENSOR PERFORMANCE (CONTINUED)

7.

(K25) BATTERY TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Disconnect the Battery Temp Sensor harness connector.

Disconnect the PCM harness connectors.

Measure the resistance between ground and the (K25) Battery Temp
Signal circuit.

Is the resistance below 100 ohms?

Yes

>> Repair the short to ground in the (K25) Battery Temp Sig-

nal circuit.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)

No

>> Go To 8

8.

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.

If there are no possible causes remaining, view repair.

Repair

Replace and program the Powertrain Control Module per Service Information.

Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0107-MAP SENSOR VOLTAGE TOO LOW

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0107-MAP SENSOR VOLTAGE TOO LOW (CONTINUED)

For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
With the engine RPM above 416 but less than 1500, the TPS voltage less than 1.13 volts, and battery voltage
greater than 10.4 volts.

•

Set Condition:
The MAP Sensor signal voltage is below 0.1 of a volt for 2.0 seconds with the engine running.

Possible Causes

(F855) 5-VOLT SUPPLY CIRCUIT OPEN

(F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND

(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND

(K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

MAP SENSOR

PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).

Diagnostic Test

1.

MAP SENSOR VOLTAGE BELOW 0.08 OF A VOLT

Ignition on, engine not running.

With a scan tool, read the MAP Sensor voltage.

Is the voltage below 0.08 of a volt?

Yes

>> Go To 2

No

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS

AND TESTING)

2.

(F855) 5-VOLT SUPPLY CIRCUIT

Turn the ignition off.

Disconnect the MAP Sensor harness connector.

Ignition on, engine not running.

Measure the voltage on the (F855) 5-volt Supply circuit in the MAP
Sensor harness connector.

Is the voltage between 4.5 to 5.2 volts?

Yes

>> Go To 3

No

>> Go To 6

DR/DH

ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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