Spectrum 3.0L GM - Ignition Control System Diagnostic Chart

91
Ignition Control System Diagnostic Chart
Step Action Value(s) Yes No
1
Did you perform the On-Board (OBD) System
Check? -
Go to Step
(2)
Go to OBD Sys-
tem Check
Section
2
 DST connected and in the system data mode.
 Crank the engine and observe the engine
speed signal on the DST
Is the value greater than the specified value?
~125 RPM
Go to Step
(5)
Go to Step (3)
3
 Check the DST for historical code sets.
(Always diagnose and repair codes with the
lowest numerical value first).
Did you find and correct the problem?
Go to Step
(16)
Go to Step (4)
4
 Run the diagnostic chart for DTC 522752
Did you find and correct the problem?
Go to Step
(16)
Go to Step (5)
5
 Disconnect the ignition module connector
C035
 Using an LED type test lamp check for a sig-
nal between the ignition module connector
pin B and battery positive
 Crank the engine
Does the LED test lamp flash while cranking the
engine?
Go to Step(6) Go to Step (10)
6
 Using a DVOM check for power between the
ignition module connector pin A and engine
ground
Do you have power?
System vol-
tage
Go to Step
(7)
Repair the sys-
tem power
circuit. Check
all system fuses
and power relay
connections
7
 Disconnect the ignition coil connector C035
 Using a digital LED test lamp check for a sig-
nal between the ignition coil connector pin B
and battery positive
 Crank the engine
Does the LED test lamp flash while cranking the
engine?
Go to Step
(8)
Go to Step (13)
8
 Using a DVOM check for voltage between the
ignition coil connector pin A and engine
ground
Does the DVOM show voltage?
System vol-
tage
Go to Step
(9)
Repair the sys-
tem power
circuit. Check
all system fuses
and power relay
connections
9
 Replace the ignition coil
Is the replacement complete?
Go to Step
(16)
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