Captiva |
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• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5 V Reference Circuit | P0641, P0452, P0107, P0532, P0522 | P0340, P0345, P0365, P0390 | P0641 | - |
Camshaft Position Sensor Signal Circuit | P0340, P0345, P0365, P0390 | P0340, P0345, P0365, P0390 | P0340, P0345, P0365, P0390 | P0341, P0346, P0366, P0391 |
Low Reference Circuit | - | P0340, P0345, P0365, P0390 | P0340, P0345, P0365, P0390 | - |
The 4X camshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an output signal circuit. The camshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past the camshaft position sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent an image of the camshaft reluctor wheel. The frequency of the camshaft position sensor output depends on the velocity of the camshaft. The ECM decodes the narrow and wide tooth pattern to identify camshaft position. This information is then used to determine the optimum ignition and injection points of the engine. The ECM uses the cylinder 1 intake camshaft position sensor to determine injector and ignition system synchronization. Also, the cylinder 1 intake camshaft position sensor is used to determine camshaft to crankshaft relationship, to control camshaft phasing, and for limp-home operation.
• | DTCs P0335, P0336, P0641, P0651, or P0697 are not set. |
• | The engine is cranking or running. |
• | The DTC runs continuously when the above conditions are met. |
• | The ECM detects that the engine has started, but has received either of the following during the first engine revolution: |
- | Less than or more than 4 camshaft position sensor pulses, if equipped with an automatic transmission |
- | Less than 4 or more than 8 camshaft position sensor pulses, if equipped with a manual transmission |
• | The ECM detects that the engine is running, but receives less than 398 camshaft position or more than 402 camshaft position sensor pulses per 100 engine cycles in 800 of 1000 engine cycles. |
• | DTCs P0341, P0346, P0366, and P0391 are Type B DTCs. |
• | The camshaft position actuator is commanded to the Home or Parked position. |
• | The ignition system defaults to a failed camshaft position sensor based on the crankshaft position sensor. |
• | DTCs P0341, P0346, P0366, and P0391 are Type B DTCs. |
• | With a DTC set, the engine may crank for an extended period of time during start-up. |
• | With a DTC set, the engine may crank for an extended period of time during start-up. |
• | The cylinder 1 intake camshaft position sensor is used for injector and ignition system synchronisation. A stalling condition will occur if the CMP sensor signal is intermittent and a DTC will not set. Inspect all cylinder 1 intake camshaft position sensor circuits for poor connections. |
Electronic Ignition System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Engine Control Module Scan Tool Information : LNQ → LE5 w/GDS → LF1 w/GDS for scan tool information
• | Close routing of aftermarket electrical equipment |
• | Close to solenoids, motors, and relays |
⇒ | Correct any wire harness routing or component placement conditions if it is determined to be a possible source of electrical interference. |
• | Exhaust Camshaft Position Active Counter Bank 1 |
• | Intake Camshaft Position Active Counter Bank 1 |
• | Exhaust Camshaft Position Active Counter Bank 2 |
• | Intake Camshaft Position Active Counter Bank 2 |
⇒ | If the above condition exists, repair the harness/connectors as necessary. |
⇒ | If the B23 camshaft position sensor is loose, inspect the sensor and the O-ring for damage and replace as necessary. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
⇒ | If less than the specified range, test the 5 V reference circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
⇒ | If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
⇒ | If the camshaft position active counter does not increment, replace the K20 ECM. |
Note: You must perform the Circuit/System Testing before proceeding with Component Testing.
⇒ | If the sensor is loose, incorrectly installed, or damaged, repair or replace the B23 crankshaft position sensor. |
⇒ | If the function does not perform as specified, replace the B23 camshaft position sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |
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