Mazda CX 7. Manual — part 143
CONTROL SYSTEM [L3 WITH TC]
01-40–13
01-40
Inspection Using An Oscilloscope (Reference)
Fan control module (No.1) signal
PCM terminals
• 1AE (+)— body ground (–)
Oscilloscope setting
• 5 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
HO2S (front) heater control signal
PCM terminals
• 2C (+)— body ground (–)
Oscilloscope setting
• 2 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
CMP sensor signal
PCM terminals
• 2S (+)— body ground (–)
Oscilloscope setting
• 2 V/DIV (Y), 100 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
2BF
Fuel injector power
supply 2
Fuel Injector relay
Ignition switch off
Below 1.0
• Fuel Injector relay
• Related wiring
harness
Ignition switch to the ON position
B+
2BG
Fuel injection
(+)(#1, #4)
Fuel injector
(No.1,No.4)
• Inspect using the wave profile.
(See01-40-6 PCM inspection
preparation.)
• Fuel injector No.1,
No.4
• Related wiring
harness
2BH
Fuel injection
(+)(#2, #3)
Fuel injector
(No.2, No.3)
• Inspect using the wave profile.
(See01-40-6 PCM inspection
preparation.)
• Fuel injector No.2,
No.3
• Related wiring
harness
Terminal
Signal
Connected to
Test condition
Voltage
(V)
Inspection item
0 V
acxuuw00000274
0 V
acxuuw00000275
0 V
acxuuw00000127
1871-1U-06B(01-40).fm 13 ページ 2006年3月15日 水曜日 午前10時53分
CONTROL SYSTEM [L3 WITH TC]
01-40–14
CKP sensor signal
PCM terminals
• 2W (+)— body ground (–)
Oscilloscope setting
• 2 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
Wastegate control solenoid valve signal
PCM terminals
• 2AA (+)— body ground (–)
Oscilloscope setting
• 20 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
• Ignition switch to the ON position
Purge control signal
PCM terminals
• 2AB (+)— body ground (–)
Oscilloscope setting
• 10 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
• Engine speed is 2,000 rpm
OCV signal
PCM terminals
• 2AF (+)— body ground (–)
Oscilloscope setting
• 2.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
ov
acxuuw00000128
0 V
acxuuw00002325
0 V
ampjjw00001527
ov
acxuuw00000129
1871-1U-06B(01-40).fm 14 ページ 2006年3月15日 水曜日 午前10時53分
CONTROL SYSTEM [L3 WITH TC]
01-40–15
01-40
Generator field coil control signal
PCM terminals
• 2AI (+)— body ground (–)
Oscilloscope setting
• 0.5 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm, no load)
Generator output voltage signal
PCM terminals
• 2AJ (+)— body ground (–)
Oscilloscope setting
• 2 V/DIV (Y),1 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
IGT1, IGT2, IGT3, IGT4 control signals
PCM terminals
• IGT1 (No.1): 2BA (+)— body ground (–)
• IGT2 (No.2): 2AW (+)— body ground (–)
• IGT3 (No.3): 2AX (+)— body ground (–)
• IGT4 (No.4): 2AT (+)— body ground (–)
Oscilloscope setting
• 2 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
Fuel injection control (–)
PCM terminals
• Fuel injection No.1: 2BB (+)— body ground (–)
• Fuel injection No.2: 2BC (+)— body ground (–)
• Fuel injection No.3: 2BD (+)— body ground (–)
• Fuel injection No.4: 2AZ (+)— body ground (–)
Oscilloscope setting
• 10 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
0 V
ampjjw00001528
0 V
ampjjw00001529
ov
ampjjw00000781
0 V
acxuuw00002326
1871-1U-06B(01-40).fm 15 ページ 2006年3月15日 水曜日 午前10時53分
CONTROL SYSTEM [L3 WITH TC]
01-40–16
Fuel injection control (+)
PCM terminals
• Fuel injection No.1, No.4: 2BG (+)— body ground
(–)
• Fuel injection No.2, No.3: 2BH (+)— body ground
(–)
Oscilloscope setting
• 20 V/DIV (Y), 400 µs/DIV (X), DC range
Vehicle condition
• Idle after warm up (no load, P/S off, A/C off)
Using the M-MDS
Note
• PIDs for the following parts are not available on this model. Perform the specific inspections for the
following parts:
— CMP sensor (See01-40-45 CAMSHAFT POSITION (CMP) SENSOR INSPECTION[L3 WITH TC].)
— Main relay
1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
3. Measure the PID value.
• If PID value is not within the specification,
follow the instructions in the “Inspection item“
column.
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, ALTF, ARPMDES, FAN_DUTY, EVAPCP, FP, FUELPW, GENVDSD, HTR11, HTR12, IMRC,
INJ_1, INJ_2, INJ_3, INJ_4, SEGRP, test, VT DUTY1, WGC
0 V
acxuuw00000277
DLC-2
acxuuw00000278
1871-1U-06B(01-40).fm 16 ページ 2006年3月15日 水曜日 午前10時53分
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