Electronic Ignition System Troubleshooting - Mazda B-Series 1997 Workshop Manual

G
ELECTRONIC IGNITION SYSTEM
TROUBLESHOOTING
2.3L, 3.OL & 4.OL El (High Data Rate) Ignition System
STEP
-
NO START (NO SPARK)
- -
INSPECTION
^ I -
ACTION
Check high-tension leads for insulation damage,
looseness, shorting or other damage
Remove and check spark plugs for damage, wear,
carbon deposits and proper plug gap
Examine all wiring harnesses and connectors
for damaged, burned or overheated insulation,
damaged pins and loose or broken conditions
Check crank shaft position sensor shield
connector
Are spark plugs and leads OK?
Key ON, engine OFF
Disconnect Scan Tool or NGS from DLC
Inspect PCM for damaged or pushed out pins,
corrosion or loose wires.
Install 104-pin breakout box and connect PCM.
Caution: Do not use an incandescent lamp to
check crankshaft position (CKP) sensor circuit.
The lamp will prevent the circuit from operating.
Measure voltage between Pin 21 at 104 pin
breakout box and ground
Is voltage between 1 .O and 2.0 volts?
Key OFF
Disconnect CKP sensor from the vehicle harness
connector
Key ON, engine OFF
Measure voltage between Pin 21 at 104 pin
breakout box and ground
Is voltage greater than
1.0
volt but less than 2.0
volts?
1
Yes
1 -
1
Yes
.
C-
1
Yes
I
Reinstall plugs and leads
Go to step 2
Replace damaged component
Go to step 8.
Go to step 3.
- -
Go to step 4.
Bias fault
Go to step
16.