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DR: Camshaft Position (CMP) Sensor

DR: Introduction See: DR: Camshaft Position (CMP) Sensor - Introduction

DR1 DTC P0340: CHECK IF ENGINE WILL START

Note: Refer to the Pinpoint Test Schematic to determine the type of CMP sensor.

• Start engine.

Will the engine start?
Yes

• GO to DR2

.

No

• DTC P0340 is not the cause of the No Start. GO to Section 3 to diagnose the No Start symptom. See: Symptom Related Diagnostic Procedures

DR2 CLEAR AND ATTEMPT TO RE-GENERATE DTC P0340

• CLEAR the DTCs.
• Increase rpm to greater than 1500 rpm for 10 seconds. Repeat two times.
• Retrieve all Continuous Memory DTCs.

Is DTC P0340 present?
Yes

• For VR type CMP:
• KEY OFF. GO to DR5
• For Hall Effect type CMP:
• KEY OFF. GO to DR3

No

• The fault that produced DTC P0340 is intermittent. GO to Z1 See: Z: Intermittent - Pinpoint Test

.

DR3 CHECK VPWR VOLTAGE TO CMP SENSOR

• Disconnect CMP sensor.
• Key on, engine off.
• Measure VPWR circuit voltage between CMP sensor harness connector and battery negative post.

Is voltage greater than 10.5 volts?
Yes

• KEY OFF. GO to DR4

.

No

• REPAIR open circuit.

DR4 CHECK PWR GND TO CMP SENSOR

• Measure resistance of PWR GND circuit between CMP sensor harness connector and battery negative post.

Is resistance less than 5.0 ohms?
Yes

• GO to DR5

.

No

• REPAIR open circuit.

DR5 CHECK FOR OPEN CMP, SIG RTN/CMP GND AND PWR GND CIRCUITS BETWEEN PCM AND CMP SENSOR

Note: Refer to the PCM connector pin numbers in the beginning of this pinpoint test.

• Disconnect PCM and CMP sensor.
• If VR type CMP: Measure resistance of CMP, CMP GND/SIG RTN circuits between PCM harness connector pin and CMP sensor harness connector.
• If Hall type CMP: Measure resistance of CMP, VPWR and PWR GND circuits between PCM harness connector and CMP sensor harness connector.

Are resistance measurements less than 5.0 ohms?
Yes

• GO to DR6

.

No

• REPAIR open circuit.

DR6 CHECK CMP CIRCUIT FOR SHORT TO POWER IN HARNESS

• Reconnect CMP sensor.
• Key on, engine off.
• If Hall type CMP: Measure voltage between CMP and VPWR circuits at the PCM harness connector.
• If VR type CMP: Measure voltage between CMP and CMP GND/SIG RTN circuits at the PCM connector.

Is voltage less than 1.0 volt?
Yes

• KEY OFF. GO to DR7

.

No

• REPAIR short circuit.

DR7 CHECK CMP CIRCUIT FOR SHORT TO GND AND SIG RTN IN HARNESS

• Disconnect CMP sensor.
• If VR type CMP: Measure resistance between CMP and CMP GND/SIG RTN at the PCM harness connector.
• If Hall type CMP: Measure resistance between CMP and PWR GND at the PCM harness connector.

Is each resistance greater than 10,000 ohms?
Yes

• GO to DR8

.

No

• REPAIR short circuit.

DR8 CHECK FOR SHORTS IN PCM

• Reconnect PCM.
• For VR type CMP: Measure resistance between CMP and CMP GND/SIG RTN circuits at the CMP harness connector.
• For Hall Effect type CMP: Measure resistance between CMP and VPWR and CMP and PWR GND circuits at the CMP harness connector.

Is each resistance greater than 500 ohms?
Yes

• For VR type CMP:
• GO to DR9

.

• For Hall Effect type CMP:
• GO to DR10

.

No

• 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.

DR9 CHECK CMP SENSOR OUTPUT

• Reconnect CMP sensor.
• Digital multimeter on ac scale (to monitor less than 5.0 volts).
• Measure voltage between CMP and CMP GND/SIG RTN circuits while running engine at varying rpm.

Does AC voltage vary greater than 0.1 volt AC?
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

• REPLACE CMP sensor.

DR10 CHECK CMP SENSOR OUTPUT DURING CRANK MODE

• Disconnect PCM.
• Reconnect CMP sensor.
• Connect digital multimeter between CMP and the CMP sensor GND circuit.
• Bump engine in short bursts with the starter without starting engine for at least 10 engine revolutions.

Does voltage reading switch between low (less than 2.0 volts dc) and high (greater than 8.0 volts dc)?
Yes

• A Hall effect type CMP sensor that is installed out of synchronization

will produce a DTC. VERIFY the correct installation by referring to
Computers and Control Systems. If CMP is installed properly, 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.
Note: If vehicle has a miss with the P0340 code, ignition/ alternator noise, RFI, and CKP concerns should be considered.

No

• REPLACE CMP sensor.