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Ignition System Diagnostic Flow Table
Step
Was "Engine and Emission Control System Check" in
Section 6 performed?
1
Ignition Spark Test
1) Check all spark plugs for condition and type referring
to "Spark Plugs Inspection" in this section.
2
2) If OK, perform ignition spark test, referring to "Igni-
tion Spark Test" in this section.
Is spark emitted from all spark plugs?
Diagnostic Trouble Code (DTC) Check
3
Is DTC stored in ECM?
Reference Waveform
Oscilloscope waveforms of CMP sensor and No.1/No.4 ignition
trigger signal are as shown in figure when connecting oscillo-
scope between terminals C63-10 of ECM connectors connected
to ECM and ground, and between terminal C64-32 and ground.
Measurement condition for waveform [A]
Measurement
terminal
Oscilloscope
setting
Measurement
condition
Measurement condition for waveform [B]
Measurement
terminal
Oscilloscope
setting
Measurement
condition
[A]: Oscilloscope waveforms at specified idle speed
[B]: Detail waveforms at specified idle speed
1. No.1 ignition trigger signal
2. CMP sensor signal
3. Primary coil current flow time
4. No.4 ignition trigger signal
Action
IGNITION SYSTEM (ELECTRONIC IGNITION SYSTEM) 6F1-5
CH1: C63-10 to C64-1
CH2: C64-32 to C64-1
CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 40 ms/DIV
After warmed up engine to normal oper-
ating temperature
Engine at specified idle speed
CH1: C63-10 to C64-1
CH2: C64-32 to C64-1
CH1: 2 V/DIV, CH2: 2 V/DIV
TIME: 10 ms/DIV
After warmed up engine to normal oper-
ating temperature
Engine at specified idle speed
Yes
Go to Step 2.
Go to Step 11.
Go to applicable
"DTC Table" in Sec-
tion 6.
No
Go to "Engine and
Emission Control Sys-
tem Check" in Section
6.
Go to Step 3.
Go to Step 4.
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