PCM INSPECTION [MZ-CD 1.6 (Y6)]


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Note
•  The PCM terminal voltage can vary with conditions when measuring and changes due to age deterioration on the vehicle, causing false diagnosis. Therefore a comprehensive inspection of the input and output systems, and the PCM is necessary to determine where the malfunction occurs.
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PCM terminal voltage table (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item(s)

101
Fuel injector No.1 (high)
Fuel injector No.1
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.1
102
Fuel injector No.4 (high)
Fuel injector No.4
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.4
103
Fuel temperature sensor Ground
Fuel temperature sensor
Under any condition
Below 1.0
•  Related wiring harness
•  Fuel temperature sensor
104
Variable boost control signal
Variable boost control solenoid valve
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Variable boost control solenoid valve
105
106
107
108
Starter
Starter relay
Cranking
Below 1.0
•  Related wiring harness
•  Starter relay
109
Fuel injector No.3 (high)
Fuel injector No.3
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.3
110
Fuel injector No.2 (high)
Fuel injector No.2
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.2
111
112
113
Catalyst exhaust gas temperature sensor No.1 ground
Catalyst exhaust gas temperature sensor No.1
Under any condition
1.0 or less
•  Catalyst exhaust gas temperature sensor
•  Related wiring harness
114
Catalyst exhaust gas temperature sensor No.2 ground
Catalyst exhaust gas temperature sensor No.2
Under any condition
1.0 or less
•  Catalyst exhaust gas temperature sensor
•  Related wiring harness
115
116
117
Fuel injector No.4 (low)
Fuel injector No.4
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.4
118
Fuel injector No.1 (low)
Fuel injector No.1
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.1
119
Diesel particulate filter differential pressure sensor ground
Diesel particulate filter differential pressure sensor
Under any condition
1.0 or less
•  Related wiring harness
•  Fuel injector No.2
120
121
EGR valve position sensor ground
EGR valve
Switch the ignition ON
Below 1.0
•  Diesel particulate filter differential pressure sensor
•  Related wiring harness
122
123
Glow plug relay monitor
Glow plug relay
Switch the ignition ON
Approx. 1.3
•  Related wiring harness
•  Glow plug relay
Idle after warm-up
B+
124
MAF
MAF/IAT sensor
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  MAF/IAT sensor
125
Fuel injector No.3 (low)
Fuel injector No.3
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.3
126
Fuel injector No.2 (low)
Fuel injector No.2
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  Fuel injector No.2
127
128
129
EGR valve position
EGR valve
Idle
Approx. 2.9
•  Related wiring harness
•  EGR valve
Switch the ignition ON
Approx. 0.9
130
131
132
Throttle valve position sensor signal
Throttle valve position sensor
Switch the ignition ON
Approx. 3.1
•  Throttle valve position sensor
•  Related wiring harness
Idle
Approx. 3.4
201
EGR valve position sensor supply
EGR valve
Switch the ignition ON
Approx. 5.0
•  Related wiring harness
•  EGR valve
202
Fuel pressure sensor supply
Fuel pressure sensor
Switch the ignition ON
Approx. 5.0
•  Related wiring harness
•  Fuel pressure sensor
203
Fuel pressure sensor ground
Fuel pressure sensor
Switch the ignition ON
Below 1.0
•  Related wiring harness
•  Fuel pressure sensor
204
MAP sensor ground
MAP sensor
Switch the ignition ON
Below 1.0
•  Related wiring harness
•  MAP sensor
205
MAP sensor supply
MAP sensor
Switch the ignition ON
Approx. 5.0
•  Related wiring harness
•  MAP sensor
206
CMP sensor supply
CMP sensor
Switch the ignition ON
Approx. 5.0
•  Related wiring harness
•  CMP sensor
207
Diesel particulate filter differential pressure sensor supply
Diesel particulate filter differential pressure sensor
Switch the ignition ON
Approx. 5.0
•  Diesel particulate filter differential pressure sensor
•  Related wiring harness
208
209
210
211
IAT sensor No.2 ground
IAT sensor No.2
Under any condition
Below 1.0
•  Related wiring harness
•  IAT sensor No.2
212
Fuel metering valve control signal
Fuel metering valve
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Fuel metering valve
•  Related wiring harness
213
214
215
216
217
218
CKP sensor supply
CKP sensor
Switch the ignition ON
Approx. 5.0
•  Related wiring harness
•  CKP sensor
219
Fuel pressure
Fuel pressure sensor
Switch the ignition off
Below 1.0
•  Related wiring harness
•  Fuel pressure sensor
Switch the ignition ON
Approx. 5.0
220
Catalyst exhaust gas temperature sensor No.2 signal
Catalyst exhaust gas temperature sensor No.2
Inspect using the M-MDS
•  Catalyst exhaust gas temperature sensor
•  Related wiring harness
221
Catalyst exhaust gas temperature sensor No.1 signal
Catalyst exhaust gas temperature sensor No.1
Inspect using the M-MDS
•  Catalyst exhaust gas temperature sensor
•  Related wiring harness
222
223
224
225
226
Oil pressure
Oil pressure switch
Switch the ignition ON
Below 1.0
•  Related wiring harness
•  Oil pressure switch
Idle
B+
227
EGR valve actuator
EGR valve
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  EGR valve
228
EGR valve actuator
EGR valve
Under any condition
Below 1.0
•  Related wiring harness
•  EGR valve
229
MAF sensor ground
MAF sensor
Under any condition
Below 1.0
•  Related wiring harness
•  MAF sensor
230
ECT
ECT sensor
Engine coolant temperature:30°C {86°F}
Approx. 2.6
•  Related wiring harness
•  ECT sensor
Engine coolant temperature:70°C {158°F}
Approx. 1.1
231
IAT
MAF/IAT sensor
Switch the ignition ON
IAT 30 °C {86 °F}
Approx. 2.1
•  Related wiring harness
•  MAF/IAT sensor
IAT 60 °C {140 °F}
Approx. 1.1
232
Fuel temperature
Fuel temperature sensor
Fuel temperature:43°C {109.4°F}
Approx. 1.6
•  Related wiring harness
•  Fuel temperature sensor
Fuel temperature:47°C {116.6°F}
Approx. 1.3
233
234
MAP
MAP sensor
Switch the ignition ON
Approx. 2.4
•  Related wiring harness
•  MAP sensor
235
236
Power supply
Main relay
Switch the ignition ON
B+
•  Related wiring harness
•  Main relay
237
CMP sensor ground
CMP sensor
Under any condition
Below 1.0
•  Related wiring harness
•  CMP sensor
238
CKP
CKP sensor
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  CKP sensor
239
CKP sensor ground
CKP sensor
Switch the ignition ON
Below 1.0
•  Related wiring harness
•  CKP sensor
240
CMP
CMP sensor
Inspect using the wave Profile. (See Inspection Using An Oscilloscope (Reference).)
•  Related wiring harness
•  CMP sensor
241
Main relay control
Main relay
Switch the ignition ON
Approx. 0.9
•  Related wiring harness
•  Main relay
242
IAT
IAT sensor No.2
Switch the ignition ON
IAT 30 °C {86 °F}
Approx. 3.5
•  Related wiring harness
•  IAT sensor No.2
243
244
ECT sensor ground
ECT sensor
Under any condition
Below 1.0
•  Related wiring harness
•  ECT sensor
245
246
Diesel particulate filter differential pressure sensor signal
Diesel particulate filter differential pressure sensor
Inspect using the M-MDS
•  Diesel particulate filter differential pressure sensor
•  Related wiring harness
247
Throttle valve actuator control signal
Throttle valve actuator
Switch the ignition ON
Approx. 0.6
•  Throttle valve position sensor
•  Related wiring harness
248
301
CAN_H
Controller area network (high)
Because this terminal is for CAN, determination by terminal voltage is not possible.
•  Related wiring harness
302
303
304
Cooling fan relay No.3
Cooling fan relay No.3
Cooling fan relay No.3 operating
Below 1.0
•  Related wiring harness
•  Cooling fan relay No.3
Cooling fan relay No.3 not operating
B+
305
306
Refrigerant pressure sensor ground
Refrigerant pressure sensor
Under any condition
Below 1.0
•  Related wiring harness
•  Refrigerant pressure sensor
307
Ground
Body ground
Under any condition
Below 1.0
•  Related wiring harness
308
Ground
Body ground
Under any condition
Below 1.0
•  Related wiring harness
309
CAN_L
Controller area network (low)
Because this terminal is for CAN, determination by terminal voltage is not possible.
•  Related wiring harness
310
APP
APP sensor
Accelerator pedal released
Approx. 3.3
•  Related wiring harness
•  APP sensor
Accelerator pedal depressed
Approx. 8.0
311
Ignition switch
Ignition switch
Switch the ignition ON
B+
•  Related wiring harness
•  Ignition switch
312
313
314
315
316
317
Brake
Brake switch
Brake pedal released
Below 1.0
•  Related wiring harness
•  Brake switch
Brake pedal depressed
B+
318
Cooling fan relay No.1
Cooling fan relay No.1
Cooling fan relay No.1 operating
Below 1.0
•  Related wiring harness
•  Cooling fan relay No.1
Cooling fan relay No.1 not operating
B+
319
320
Generator
Generator
Under any condition
Below 1.0
•  Related wiring harness
•  Generator
321
322
323
Refrigerant pressure sensor supply
Refrigerant pressure sensor
Switch the ignition ON
Approx. 5.0
•  Related wiring harness
•  Refrigerant pressure sensor
324
Refrigerant pressure
Refrigerant pressure sensor
Switch the ignition ON
Approx. 1.5
•  Related wiring harness
•  Refrigerant pressure sensor
325
326
Glow plug relay
Glow plug relay
Glow plug relay operating
Below 1.0
•  Related wiring harness
•  Glow plug relay
Glow plug relay not operating
B+
327
328
329
330
A/C relay
A/C relay
Idle
Refrigerant pressure switch on
Below 1.0
•  Related wiring harness
•  A/C relay
Refrigerant pressure switch off
B+
331
Power supply
Main relay
Switch the ignition ON
B+
•  Related wiring harness
•  Main relay
332
Ground
Body ground
Under any condition
Below 1.0
•  Related wiring harness


Inspection Using An Oscilloscope (Reference)


Fuel injector (+) signal

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PCM terminals
•  No.1: 101 (+)—Body ground (–)
•  No.2: 110 (+)—Body ground (–)
•  No.3: 109 (+)—Body ground (–)
•  No.4: 102 (+)—Body ground (–)
Oscilloscope setting
•  50 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm-up


Variable boost control signal

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PCM terminals
•  104 (+)—Body ground (–)
Oscilloscope setting
•  5 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm-up


Fuel injector (-) signal

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PCM terminals
•  No.1: 118 (+)—Body ground (–)
•  No.2: 126 (+)—Body ground (–)
•  No.3: 125 (+)—Body ground (–)
•  No.4: 117 (+)—Body ground (–)
Oscilloscope setting
•  50 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm-up


MAF sensor signal

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PCM terminals
•  124 (+)—Body ground (–)
Oscilloscope setting
•  5 V/DIV (Y), 200 us/DIV (X), DC range
Vehicle condition
•  Idle after warm-up


Fuel metering valve signal

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PCM terminals
•  212 (+)—Body ground (–)
Oscilloscope setting
•  5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm-up


EGR valve actuator signal

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PCM terminals
•  227 (+)—Body ground (–)
Oscilloscope setting
•  5 V/DIV (Y), 400 us/DIV (X), DC range
Vehicle condition
•  Idle after warm-up


CKP sensor signal

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PCM terminals
•  238 (+)—Body ground (–)
Oscilloscope setting
•  5 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm-up


CMP sensor signal

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PCM terminals
•  240 (+)—Body ground (–)
Oscilloscope setting
•  2.5 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
•  Idle after warm-up