PCM INSPECTION [WL-C, WE-C]

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Without Using the M-MDS

Note

•  The PCM terminal voltage can vary with the conditions when measuring and changes due to aged deterioration on the vehicle, causing false diagnosis. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM.

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Terminal voltage table (Reference)

Inspection Using An Oscilloscope (Reference)

Fuel injector signal

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PCM terminals

•  Fuel injection (#1): 125, 174 (+)—body ground (–)

•  Fuel injection (#2): 102, 149 (+)—body ground (–)

•  Fuel injection (#3): 101, 173 (+)—body ground (–)

•  Fuel injection (#4): 126, 150 (+)—body ground (–)

Oscilloscope setting

•  20 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

CMP signal

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PCM terminals

•  160 (+)—body ground (–)

Oscilloscope setting

•  2 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

VBC solenoid valve signal

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PCM terminals

•  178 (+)—body ground (–)

Oscilloscope setting

•  10 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

Fuel Metering Valve signal

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PCM terminals

•  179 (+)—body ground (–)

Oscilloscope setting

•  10 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up, A/C ON

Vehicle speed signal

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PCM terminals

•  184 (+)—body ground (–)

Oscilloscope setting

•  1 V/DIV (Y), 2.5 ms/DIV (X), DC range

Vehicle condition

•  Vehicle speed is 32 km/h {20 mph}.

CKP signal

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PCM terminals

•  192, 193 (+)—body ground (–)

Oscilloscope setting

•  5 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition

•  Idle after warm up

Using the M-MDS

Caution

•  The PCM terminal voltage vary with change in measuring conditions and vehicle conditions.

Always carry out a total inspection of the input systems, output systems, and PCM to determine the cause of trouble. Otherwise, diagnosis will be incorrect.

Note

•  PIDs for the following parts are not available on this model. Go to the appropriate part inspection page.

―  Fuel injector

―  CMP sensor

―  EGR valve position sensor

―  EGR solenoid valve

―  IAT sensor No.2

1.  Connect the M-MDS to the DLC-2. (See ON-BOARD DIAGNOSTIC TEST [WL-C, WE-C].)

2.  Measure the PID value.

•  If PID value is not within the specification, follow the instructions in ACTION column.

3.  Turn the engine switch to the ON position (Engine off).

Note

•  The PID/DATA MONITOR function monitors the calculated value of the input/output signals in the PCM. Therefore, an output device malfunction is not directly indicated as a malfunction of the monitored value for the output device. If a monitored value of an output device is out of specification, inspect the monitored value of the input device related to the output control.

•  For input/output signals except those of the monitoring items, use a voltmeter to measure the PCM terminal voltage.

•  The simulation items that are used in the ENGINE CONTROL SYSTEM OPERATION INSPECTION are as follows.

―  ACCS, EGRV2, GP_LMP, GPC, IASV, IASV2, INJ_1, INJ_2, INJ_3, INJ_4, SCV, SEGRP, VBCV

PID Monitor Table (Reference)