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Diagnostic Aids

WARNING: This page is about a different car, the 1995 Mazda MX-6 and 1995 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

The CID signal provides PCM information for fuel injector synchronization. CID signal originates from Camshaft Position (CMP) sensor.

Perform this test when directed by QUICK TEST. This test is intended to diagnose:

1) Continuous Memory Code 214 Or KOER Code 244  Code 214 or 244 indicates error has been detected in CID sensor input signal. Error could be due to a hard fault or an intermittent fault. Possible causes for this code are:

Start engine. If engine starts, go to next step. If engine does not start, go to step 10).

2) Attempt To Generate Code 214  Clear continuous memory codes. Start engine. Raise engine speed to 1500 RPM for 10 seconds. Return to idle speed. Raise speed to 1500 RPM for 10 seconds again. Turn ignition off. Perform KOEO SELF-TEST. If Continuous Memory Code 214 is not present, go to step 20). If Continuous Memory Code 214 is present, go to next step.

3) Check CID Circuit Continuity  Disconnect CMP sensor. Disconnect PCM 60-pin connector and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (49-UN01-058), leaving PCM disconnected. Measure resistance between CID or CID (+) test pin at breakout box and CID or CID (+) terminal at CMP sensor wiring harness connector. If any resistance is 5 ohms or more, repair open circuit. Remove breakout box, reconnect all components and repeat QUICK TEST. If each resistance is less than 5 ohms, go to next step.

4) Check CID Circuit For Short To Power  Turn ignition off. Disconnect CMP sensor. Disconnect PCM. Ensure scan tester is not connected to vehicle. Turn ignition on. Measure voltage between CID or CID (+) test pin and test pin No. 40 at breakout box. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to power in CID circuit. Remove breakout box, reconnect all components and repeat QUICK TEST.

5) Check CID Circuit For Short To Ground  Turn ignition off. Disconnect CMP sensor. Disconnect PCM. Measure resistance between CID or CID (+) test pin and pins No. 16, 40 and 46 at breakout box. If any reading is 10,000 ohms or less, repair short circuit. Remove breakout box, reconnect all components and repeat QUICK TEST. If all readings are more than 10,000 ohms, go to step 7).

6) Check VPWR Circuit Voltage  Disconnect CMP sensor. Disconnect PCM. Turn ignition on. Measure voltage between VPWR terminal at CMP sensor and negative battery terminal. If voltage is less than 10.5 volts, repair open in VREF circuit. Remove breakout box, reconnect all components and repeat QUICK TEST. If voltage is 10.5 volts or more, go to next step.

7) Check For Shorts In PCM  Turn ignition off. Disconnect CMP sensor. Connect PCM to breakout box. Measure resistance between test pin No. 24 and test pins No. 16, 37, 40, 46, 57 and 60 at breakout box. If all readings are more than 500 ohms, go to next step. If any reading is 500 ohms or less, replace PCM. Remove breakout box, reconnect all components and repeat QUICK TEST.

8) Check CMP Sensor Output  Turn ignition off. Reconnect CMP sensor. Set DVOM on AC scale. Start engine. Measure voltage between test pins No. 24 and 40 at breakout box while varying engine RPM. If voltage varies more than 0.1 volt, replace PCM. Remove breakout box, reconnect all components and repeat QUICK TEST. If voltage does not vary more than 0.1 volt, replace CMP sensor. Remove breakout box, reconnect all components and repeat QUICK TEST.

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 8) to step 10). No test procedures have been omitted.

10) Check VPWR At CMP Sensor  Turn ignition off. Disconnect CMP sensor. Turn ignition on. Measure voltage between VPWR terminal at CMP sensor wiring harness connector and negative battery terminal. If voltage is less than 10.5 volts, repair open in VREF circuit and repeat QUICK TEST. If voltage is 10.5 volts or more, VPWR circuit is okay. Check and repair ignition system as necessary. See IGNITION SYSTEM in appropriate SYSTEM/COMPONENT TESTS - 2.0L .

NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 10) to step 20). No test procedures have been omitted.

20) Check CID Circuit  Enter wiggle test. See CONTINUOUS MONITOR MODE (WIGGLE TEST) under QUICK TEST. Observe analog VOM or diagnostic tester for indication of fault while performing following: grasp wiring harness near PCM wiring harness connector while observing VOM or diagnostic tester for fault indication. Shake and bend small sections of harness, working from PCM toward sensor. If fault is indicated, isolate fault and repair as necessary. Repeat QUICK TEST. If no fault is indicated, problem cannot be duplicated at this time. See SYMPTOMS in TESTS W/O CODES article.

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