Service Information

Captiva

DTC P0096, P0097, P0098, or P0099 - LNP or LNQ

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC P0096 00: Intake Air Temperature (IAT) Sensor 2 Performance

DTC P0097 00: Inlet Air Temperature (IAT) Sensor 2 Circuit Low Voltage

DTC P0098 00: Inlet Air Temperature (IAT) Sensor 2 Circuit High Voltage

DTC P0099 00: Intake Air Temperature (IAT) Sensor 2 Circuit Intermittent

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Signal	P0097 00	P0099 00	P0098 00	P0096 00
Low Reference	-	P0099 00	P0098 00	P0096 00

Circuit/System Description

The inlet air temperature (IAT) sensor 1 is an integral part of the mass air flow (MAF) sensor. The IAT sensor is a variable resistor that measures the temperature of the inlet air. The engine control module (ECM) supplies 5 V to the IAT signal circuit and supplies a ground to the low reference circuit.

The following table illustrates the difference between temperature, resistance, and voltage:

IAT	IAT Resistance	IAT Signal Voltage
Cold	High	High
Warm	Low	Low

Conditions for Running the DTC

•	The ignition is ON or the engine is running.

•	The ignition voltage is greater than 8.5 V.

•	The DTCs run continuously once the above conditions are met.

Conditions for Setting the DTC

P0096 00

The ECM detects that the IAT 2 deviates less than 1.5°C (35°F) since engine start.

P0097 00

The ECM detects that an IAT 2 circuit is shorted to ground.

P0098 00

The ECM detects that an IAT 2 circuit is shorted to voltage.

P0099 00

The ECM detects that an IAT 2 circuit is open.

Action Taken When the DTC Sets

DTCs P0096 00, P0097 00, P0098 00 and P0099 00 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0096 00, P0097 00, P0098 00 and P0099 00 are Type B DTCs.

Diagnostic Aids

•	If the engine has sat overnight, the IAT sensor and the engine coolant temperature (ECT) sensor values should display within 3°C (5°F).

•	High resistance on either the IAT sensor signal circuit or the IAT sensor low reference circuit may set a DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the DTC information with a scan tool. DTC P0096 00, P0097 00, P0098 00 and P0099 00 should not set.
Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Circuit/System Testing

Ignition OFF disconnect the harness connector at the B65 Inlet Manifold Pressure and Air Temperature Sensor.
Test for less than 5 Ω of resistance between the low reference circuit terminal 1 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

Ignition ON, test for 4.8-5.2 V between the IAT signal circuit terminal 3 and ground.

⇒	If less than the specified range, test the signal circuit for an open or a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

Install a 10 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool IAT Sensor 2 parameter is less than 0.3 V.

⇒	If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

If all circuits test normal, test or replace the B65 Intake Manifold Pressure and Air Temperature Sensor.

Component Testing

Static Test

Test and record the resistance between the signal circuit terminal 3 and the low reference circuit terminal 1 at various ambient temperatures. Compare those measurements to the Temperature Versus Resistance : Exhaust Temperature Sensor → ECT and IAT Sensor table and verify that the resistance is within 5% of the specification.

⇒	If not within the specified range, replace the B65 Inlet manifold Pressure and Air Temperature Sensor

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Inlet Air Pressure and Temperature Sensor Replacement

•	Control Module References for ECM replacement, programming and setup