DM: Thermal Manifold Absolute Pressure (TMAP) Sensor

DM: Introduction See: DM: Thermal Manifold Absolute Pressure (TMAP) Sensor - Introduction

DM1 DTC P0107 AND P0108: CHECK VOLTAGE BETWEEN VREF AND SIG RTN AT TMAP SENSOR

• Disconnect TMAP connector.
• Measure voltage between VREF and SIG RTN circuits at the TMAP sensor harness connector.

Is VREF voltage between 4.0 and 6.0 volts?
Yes

• GO to DM2

No

• GO to C1 See: C: Reference Voltage - Pinpoint Test

.

DM2 CHECK TMAP SENSOR OPERATION

• Connect a jumper wire for the VREF circuit between the TMAP sensor harness connector and sensor connector.
• Connect jumper wire for the SIG RTN circuit between the TMAP sensor harness connector and sensor connector
• Start engine and let idle.
• Measure voltage between MAP circuit at the MAP sensor connector and chassis ground.
• Observe voltage while rapidly increasing rpm to 3000 by depressing the accelerator pedal and then release.

Did the voltage reading rapidly increase to approximately 4.0 volts and then decrease to approximately 0.7 volts?

• GO to DM3

No

• Replace TMAP sensor.

DM3 CHECK TMAP CIRCUIT FOR SHORT TO VREF AND SIG RTN IN HARNESS

• Disconnect PCM.
• Measure resistance between the TMAP circuit and both the VREF and SIG RTN circuits at the TMAP sensor harness connector

Is each resistance greater than 10,000 ohms?
Yes

• GO to DM4

No

• REPAIR short circuit.

DM4 CHECK TMAP SENSOR CIRCUIT FOR OPEN IN HARNESS

• Disconnect PCM.
• Measure resistance of MAP circuit between PCM harness connector pin 63 and MAP sensor harness connector.

Is resistance less than 5.0 ohms?
Yes

• REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) See: Programming and Relearning\Flash Electrically Eraseable Programmable Read Only Memory - Flash EEPROM).

No

• REPAIR open circuit.

DM6 CONTINUOUS MEMORY DTC P0107, P0108: CHECK FOR INTERMITTENT CIRCUITS TO TMAP SENSOR

• Key on, engine off.
• Access MAP V PID
• Observe MAP V PID for an indication of a fault while performing the following (a fault will be indicated in a sudden change in the MAP V PID voltage):
• Shake, wiggle, bend the MAP, SIG RTN and VREF circuits between the MAP sensor and the PCM.
• Lightly tap on the MAP sensor to simulate road shock.

Is a fault indicated?
Yes

• ISOLATE fault and REPAIR as necessary.

No

• KEY OFF. Unable to duplicate or identify fault at this time. GO to Z1 See: Diagnostic Trouble Code Tests and Associated Procedures\SECTION 5: Pinpoint Tests\Z: Intermittent - Pinpoint Test