DTC P0320:00 [MZI-3.7]

id0102d2313000

DTC P0320:00 | Ignition/distributor engine speed input circuit
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DETECTION CONDITION | • The ignition engine speed sensor input signal to the PCM is continuously monitored. • The test fails when the signal indicates that 2 successive erratic PIP pulses occurred.
POSSIBLE CAUSE | • Loose wires/connectors. • CKP sensor and/or trigger wheel physically damaged • CKP sensor malfunction • Arching secondary ignition components (coil, wires or plugs). • On-board transmitter (2-way radio). • CKP sensor circuits short to each other • Open circuit between PCM terminal 2V and CKP sensor terminal A • Open circuit between PCM terminal 2R and CKP sensor terminal B • Short to ground circuit between PCM terminal 2V and CKP sensor terminal A • Short to ground circuit between PCM terminal 2R and CKP sensor terminal B • Short to power supply circuit between PCM terminal 2V and CKP sensor terminal A • Short to power supply circuit between PCM terminal 2R and CKP sensor terminal B • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 | VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | VERIFY RELATED PENDING CODE OR STORED DTCs • Turn the ignition switch off then to the ON position (Engine off). • Verify related pending code or stored DTCs. • Are other DTCs present? | Yes | Go to the appropriate DTC troubleshooting. (See DTC TABLE [MZI-3.7].)
No | Go to the next step.
4 | INSPECT CKP SENSOR SIGNAL SENT TO PCM Note • The battery should be fully charged and the starting system should be functioning properly. • Turn the ignition switch to the ON position (Engine off) • Access the PCM and monitor the RPM PID. • Crank the engine. • Is the engine speed more than 150 rpm? | Yes | Go to Step 13. (The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.)
No | Go to the next step.
5 | INSPECT TIMING COVER, CKP SENSOR AND EXTERNAL TRIGGER WHEEL (OUTSIDE TIMING COVER) FOR OBVIOUS PHYSICAL DAMAGE • Turn the ignition switch off. • Visually check the timing cover, CKP sensor and external trigger wheel (outside the timing cover) for obvious physical damage. • Do any parts appear physically damaged? | Yes | Repair if necessary. Then go to Step 13.
No | Go to Step.
6 | INSPECT FOR PROPER CKP BIAS VOLTAGES IN PCM • Disconnect the CKP sensor connector. • Turn the ignition switch to the ON position (Engine off) • Measure the voltage between: ― CKP sensor terminal A on the wiring harness side and battery negative ― CKP sensor terminal B on the wiring harness side and battery negative • Are the voltages between 1—3 V? | Yes | Go to the next step.
No | Go to Step 9.
7 | INSPECT CKP SENSOR RESISTANCE • CKP sensor connector is disconnected. • Turn the ignition switch off. • Measure the resistance between CKP sensor terminal A and B on the component side. • Is the resistance between 575—790 ohms? | Yes | Go to the next step.
No | Replace the CKP sensor. Then go to Step 13.
8 | INSPECT CKP WIRING HARNESS SHIELD CIRCUIT FOR SHORT TO GROUND Note • The wiring harness shield protects the CKP signal from electrical noise and is grounded at one end, typically near the PCM. Note • Perform the following resistance measurement between the CKP shield and the ground. • CKP sensor connector is disconnected. • Measure the resistance between: ― CKP_SHLD assembly connector wiring harness side and ground • Is the resistance less than 5 ohms? | Yes | Go to the next step.
No | Repair the short circuit. Check for a poor ground. Then go to Step 13.
9 | INSPECT FOR SHORT BETWEEN CKP (+) AND CKP (-) IN WIRING HARNESS • CKP sensor connector is disconnected. • Turn the ignition switch off. • Disconnect the PCM connector. • Measure the resistance between: ― CKP sensor terminal A and B on the wiring harness side • Is the resistance more than 10 kilohms? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to Step 13.
10 | INSPECT CKP CIRCUIT(S) FOR OPEN CIRCUIT IN WIRING HARNESS • CKP sensor and PCM connectors are disconnected. • Measure the resistance between: ― CKP sensor connector A on the wiring harness side and PCM terminal 2V ― CKP sensor connector B on the wiring harness side and PCM terminal 2R • Are the resistances less than 5 ohms? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to Step 13.
11 | INSPECT CKP CIRCUIT(S) FOR SHORT TO GROUND IN WIRING HARNESS • CKP sensor and PCM connectors are disconnected. • Measure the resistance between: ― CKP sensor connector A on the wiring harness side and battery negative ― CKP sensor connector B on the wiring harness side and battery negative • Are the resistances more than 10 kilohms? | Yes | Go to the next step.
No | Repair or replace suspected part, then go to Step 13.
12 | INSPECT CKP CIRCUIT FOR SHORT TO VOLTAGE IN WIRING HARNESS • CKP sensor and PCM connectors are disconnected. • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between: ― CKP sensor connector A on the wiring harness side and battery negative ― CKP sensor connector B on the wiring harness side and battery negative • Are any voltage present? | Yes | Repair or replace suspected part, then go to the next step.
No | Go to the next step. (The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.)
13 | VERIFY TROUBLESHOOTING OF DTC P0320:00 HAS BEEN COMPLETED • Verify that all disconnected connectors are reconnected. • Turn the ignition switch to the ON position (Engine off). • Clear the DTC from the PCM memory using the M-MDS. • Perform the KOER self-test. (See KOEO/KOER SELF TEST [MZI-3.7].) • Is the PENDING CODE for this DTC present? | Yes | Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZI-3.7].) Go to the next step.
No | Go to the next step.
14 | VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [MZI-3.7].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [MZI-3.7].)
No | Troubleshooting completed.