Mazda Protege 5. Manual - part 95
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]
01–03A–33
01–03A
4
•
Connect WDS or equivalent to DLC-2.
•
Access RPM PID, MAF PID, TP PID, and
VSS PID.
•
Drive vehicle with monitoring PIDs.
•
Are PIDs within specification?
(See 01–40A–7 PCM Inspection Using the
SST (WDS or equivalent).)
Yes
Go to next step.
No
RPM PID:
•
Inspect CKP sensor and related harness for vibration
and/or intermittent open/short circuit.
MAF PID:
•
Inspect for intermittent open circuit of MAF sensor and
related wire harness.
TP PID:
•
Inspect if TP sensor output increases smoothly.
VSS PID:
•
Inspect for intermittent open circuit of VSS and related
wire harness.
5
•
Visually inspect CKP sensor and teeth of
crankshaft pulley.
•
Are CKP sensor and teeth of crankshaft
pulley okay?
Yes
Go to next step.
No
Replace malfunctioning parts.
6
•
Measure gap between CKP sensor and teeth
of crankshaft pulley.
Gap
0.5—1.5 mm {0.020—0.059 in}
•
Is the gap within specification?
Yes
Go to next step.
No
Adjust CKP sensor.
7
•
Inspect condition of spark plugs.
•
Is spark plug wet, covered with carbon or
grayish white?
Yes
Spark plug is wet or covered with carbon:
•
Inspect for fuel leakage from fuel injector.
Spark plug is grayish white:
•
Inspect for clogged fuel injector.
No
Install spark plugs on original cylinders.
Go to next step.
8
•
Remove and shake PCV valve.
•
Does PCV valve rattle?
Yes
Go to next step.
No
Replace PCV valve.
9
•
Is there restriction in exhaust system?
Yes
Inspect exhaust system.
No
Go to next step.
10
•
Install fuel pressure gauge between fuel filter
and fuel distributor.
•
Connect jumper wire between F/P terminal at
DLC in engine compartment and GND.
•
Turn ignition switch on.
•
Is fuel line pressure correct with ignition
switch on?
Fuel line pressure
270—310 kPa {2.7—3.2 kgf/cm
2
, 39—45 psi}
Yes
Go to next step.
No
Zero or low:
•
Inspect fuel pump circuit.
•
Inspect for open fuel pump relief valve.
•
Inspect for fuel leakage inside pressure regulator.
•
Inspect for clogged main fuel line.
High:
•
Inspect pressure regulator for high pressure cause.
•
Inspect for clogged fuel return line.
11
•
Inspect for tumble swirl control system
operation.
(See 01–03A–58 Variable Tumble Control
System (VTCS) Inspection.)
•
Does tumble swirl control system work
properly?
Yes
Go to next step.
No
Repair or replace malfunctioning parts.
12
Note
•
Following test is for engine stalling with A/
C on concern. If other symptoms exist, go
to next step.
•
Connect pressure gauge to A/C low and high
side pressure lines.
•
Turn A/C on and measure low side and high
side pressure.
•
Are pressure within specifications?
(See 07–10–3 REFRIGERANT PRESSURE
CHECK.)
Yes
Go to next step.
No
If A/C is always on, go to symptom troubleshooting “NO.24
A/C IS ALWAYS ON/ A/C COMPRESSOR RUNS
CONTINUOUSLY [ZM]”.
For other symptoms, inspect following:
•
Refrigerant charging amount
•
Condenser fan operation
STEP
INSPECTION
ACTION
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