DTC P0657 Actuator Supply Voltage Circuit / Open

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1 301 DTC P0657 Actuator Supply Voltage Circuit / Open DCRIPTION The ECM monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is functioning properly. The output voltage usually is 0 V when the ignition switch is turned OFF. If the output voltage is higher than 7 V when the ignition switch is turned OFF, the ECM will illuminate the MIL and set a DTC when the ignition switch is turned ON. DTC No. DTC Detection Condition Trouble Area P0657 Throttle actuator power supply error ECM MONITOR STRATEGY Related DTCs Required sensors / components (main) Required sensors / components (sub) Frequency of operation Duration MIL operation Sequence of operation ECM Throttle actuator Once per driving cycle Within 1 second Immediate TYPICAL ENABLI CONDITIONS Ignition switch From ON to OFF TYPICAL MALFUNCTION THRHOLDS Throttle actuator power supply 7 V or more INSPECTION PROCEDURE 1 CHECK DTC Clear DTC. (b) Turn the ignition switch OFF. (c) Disconnect the cable from the negative battery terminal and wait for 1 minute. (d) Connect the cable to the negative battery terminal. (e) Turn the ignition switch ON for 10 seconds. (f) Turn the ignition switch OFF. (g) Turn the ignition switch ON. (h) Check DTC. : P0657 is not present. REPLACE ECM INTERMITTENT PROBLEMS

2 302 DTC DTC P1340 P1341 Camshaft Position Sensor "A" (Bank 1 Sensor 2) Camshaft Position Sensor "A" (Bank 1 Sensor 2 ) DCRIPTION The camshaft position sensor (G signal) consists of a magnet, iron core and pickup coil. The camshaft drive gear (LH) has 3 teeth on its inner circumstance. When the camshaft gear rotates, air gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field and results in changes in the resistance of the MRE element. The crankshaft signal plate has 32 teeth and is mounted on the crankshaft. The crankshaft position sensor generates 32 signals at every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and the actual crankshaft angle and the engine speed by the NE signal. DTC No. DTC Detection Condition Trouble Area P1340 P1341 No camshaft position sensor signal to ECM during cranking (2 trip detection logic) No camshaft position sensor signal to ECM with engine speed 600 rpm or more Open or short in camshaft position sensor circuit Camshaft position sensor Camshaft timing pulley LH ECM MONITOR DCRIPTION The camshaft position sensor (G signal) consists of a magnet and MRE element. The camshaft drive gear has 5 teeth on its inner circumference. When the camshaft gear rotates, air gap changes between the protrusion on the gear and the pickup coil. The change affects the magnetic field and results in changes in the resistance of the MRE element. The crankshaft angle sensor plate has 32 teeth and outputs 32 signals at every engine revolution. The ECM detects the standard crankshaft angle based on the G signal and actual crankshaft angle and engine speed by NE signal. MONITOR STRATEGY Related DTCs Required Sensors/Components (Main) Required Sensors/Components (Related) Frequency of Operation Duration MIL Operation Sequence of Operation P1340: Camshaft position sensor range check P1340: Camshaft position / Crankshaft position misalignment P1341: Camshaft position sensor malfunction Camshaft position sensor Crankshaft position sensor, Engine speed sensor Continuous 5 seconds 2 driving cycles: Camshaft position sensor range check Immediate: Camshaft position / Crankshaft position misalignment and camshaft position sensor malfunction TYPICAL ENABLI CONDITIONS All: The monitor will run whenever these DTCs are not present Camshaft position sensor range check: Minimal battery voltage while starter ON ON Less than 11 V Camshaft position / Crankshaft position misalignment: Engine RPM 600 rpm or more

3 303 Camshaft position sensor malfunction: OFF After OFF to ON timing TYPICAL MALFUNCTION THRHOLDS Camshaft position sensor range check: Camshaft position signal No signal Camshaft position / Crankshaft position misalignment: Camshaft position and crankshaft position phase Misaligned Camshaft position sensor malfunction: Camshaft position and crankshaft position phase Camshaft position signal per 2 revolutions of crankshaft COMPONENT OPERATI RAE Camshaft position sensor signal Misaligned 12 signals or more Camshaft position sensor voltage fluctuates when the camshaft rotates 3 signals per revolution of crankshaft WIRI DIAGRAM Refer to DTC P0335 (See page -195). INSPECTION PROCEDURE HINT: Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction. 1 CHECK HARNS AND CONNECTOR (SENSOR POWER SOURCE) Wire Harness Side Camshaft Position Sensor Connector (b) (c) Disconnect the C1 camshaft position sensor connector. Turn the ignition switch ON. Measure the voltage between terminal 3 of the camshaft position sensor connector and body ground. Standard voltage C1-3 - Body ground 4.5 to 5.0 V C1 (d) Reconnect the camshaft position sensor connector. REPAIR OR REPLACE HARNS OR CONNECTOR Front View A115895E01

4 304 2 CHECK ECM TERMINAL VOLTAGE ECM Connector E6 Inspect the ECM using an oscilloscope. (1) While the engine is idling, check the waveform between the terminals of the ECM connector. Standard voltage G2+ (E6-19) - G2- (E6-29) Correct waveform is as shown 2 V/DIV. G2+ G2- HINT: *1: Crank angle *2: 180 *3: 120 *4: 60 *1 REPLACE ECM *2 *3 *4 *3 *4 *2 200 ms./div. A115714E01 3 CHECK HARNS AND CONNECTOR (ECM - CAMSHAFT POSITION SENSOR) Wire Harness Side Camshaft Position Sensor Connector (b) (c) Disconnect the C1 Camshaft position sensor connector. Disconnect the E6 ECM connector. Measure the resistance between wire harness side connectors. Standard resistance C1 Front View Camshaft position sensor (C1-2) - G2+ (E6-19) Camshaft position senssor (C1-1) - G2- (E6-29) Below 1 Ω E6 ECM Connector Camshaft position sensor (C1-2) or G2+ (E6-19) - Body ground Camshaft position sensor (C1-1) or G2- (E6-29) - Body ground 10 kω or higher (d) (e) Reconnect the ECM connector. Reconnect the Camshaft position sensor connector. G2+ G2- A115715E01 REPAIR OR REPLACE HARNS OR CONNECTOR

5 305 4 INSPECT SENSOR INSTALLATION Check the camshaft position sensor installation. : The camshaft position sensor is installed properly. REPAIR OR REPLACE SENSOR Clearance BR03795E10 5 INSPECT CAMSHAFT TIMI PULLEY LH (SIGNAL PLATE TOOTH) REPLACE CAMSHAFT TIMI PULLEY LH REPLACE CAMSHAFT POSITION SENSOR

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