SYMPTOM DIAGNOSTIC INDEX [MZI-3.7]

id0103d2800500

•  Confirm trouble symptom using the following diagnostic index, then go to appropriate troubleshooting chart.

Diagnostic Index

No.

TROUBLESHOOTING ITEM

DESCRIPTION

PAGE
1
Melting of main or other fuses
—
(See NO.1 MELTING OF MAIN OR OTHER FUSES [MZI-3.7].)
2
MIL illuminates
•  MIL is illuminated incorrectly.
(See NO.2 MIL ILLUMINATES [MZI-3.7].)
3
Will not crank
•  Starter does not work.
(See NO.3 WILL NOT CRANK [MZI-3.7].)
4
Hard to start/long crank/erratic start/erratic crank
•  Starter cranks engine at normal speed but engine requires excessive cranking time before starting.
(See NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [MZI-3.7].)
5
Engine stalls
After start/at idle
•  Engine stops unexpectedly.
(See NO.5 ENGINE STALLS-AFTER START/AT IDLE [MZI-3.7].)
6
Cranks normally but will not start
•  Starter cranks engine at normal speed but engine will not run.
(See NO.6 CRANKS NORMALLY BUT WILL NOT START [MZI-3.7].)
7
Slow return to idle
•  Engine takes more time than normal to return to idle speed.
(See NO.7 SLOW RETURN TO IDLE [MZI-3.7].)
8
Engine runs rough/rolling idle
•  Engine speed fluctuates between specified idle speed and lower speed and engine shakes excessively.
•  Idle speed is too slow and engine shakes excessively.
(See NO.8 ENGINE RUNS ROUGH/ROLLING IDLE [MZI-3.7].)
9
Fast idle/runs on
•  Engine speed continues at fast idle after warm-up.
•  Engine runs after ignition switch is turned to off position.
(See NO.9 FAST IDLE/RUNS ON [MZI-3.7].)
10
Low idle/stalls during deceleration
•  Engine stops unexpectedly at beginning of deceleration or recovery from deceleration.
(See NO.10 LOW IDLE/STALLS DURING DECELERATION [MZI-3.7].)
11
Engine stalls/quits
Acceleration/cruise
•  Engine stops unexpectedly at beginning of acceleration or during acceleration.
•  Engine stops unexpectedly while cruising.
(See NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK, HESITATION/STUMBLE, SURGES [MZI-3.7].)
Engine runs rough
Acceleration/cruise
•  Engine speed fluctuates during acceleration or cruising.
Misses
Acceleration/cruise
•  Engine misses during acceleration or cruising.
Buck/jerk
Acceleration/cruise/ deceleration
•  Vehicle bucks/jerks during acceleration, cruising, or deceleration.
Hesitation/stumble
Acceleration
•  Momentary pause at beginning of acceleration or during acceleration.
Surges
Acceleration/cruise
•  Momentary pause at beginning of acceleration or during acceleration.
12
Lack/loss of power
Acceleration/cruise
•  Performance is poor under load (such as power down when climbing hills).
(See NO.12 LACK/LOSS OF POWER-ACCELERATION/CRUISE [MZI-3.7].)
13
Knocking/pinging
Acceleration/cruise
•  Sound is heard when air/fuel mixture is ignited by something other than spark plug (such as hot spot in combustion chamber).
(See NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [MZI-3.7].)
14
Poor fuel economy
•  Fuel economy is unsatisfactory.
(See NO.14 POOR FUEL ECONOMY [MZI-3.7].)
15
Emission compliance
•  Fails emissions test.
(See NO.15 EMISSION COMPLIANCE [MZI-3.7].)
16
High oil consumption/leakage
•  Oil consumption is excessive.
(See NO.16 HIGH OIL CONSUMPTION/LEAKAGE [MZI-3.7].)
17
Cooling system concerns
Overheating
•  Engine runs at higher than normal temperature/overheats.
(See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [MZI-3.7].)
18
Cooling system concerns
Runs cold
•  Engine takes excessive time to reach normal operating temperature.
(See NO.18 COOLING SYSTEM CONCERNS-RUNS COLD [MZI-3.7].)
19
Exhaust smoke
•  Blue, black, or white smoke from exhaust system.
(See NO.19 EXHAUST SMOKE [MZI-3.7].)
20
Fuel odor (in engine compartment)
•  Gasoline fuel smell or visible leakage.
(See NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI-3.7].)
21
Engine noise
•  Engine noise from under bonnet.
(See NO.21 ENGINE NOISE [MZI-3.7].)
22
Vibration concerns (engine)
•  Vibration from under bonnet or driveline.
(See NO.22 VIBRATION CONCERNS (ENGINE) [MZI-3.7].)
23
A/C does not work sufficiently
•  A/C compressor magnetic clutch does not engage when A/C is turned on.
(See NO.23 A/C DOES NOT WORK SUFFICIENTLY [MZI-3.7].)
24
A/C is always on or A/C compressor runs continuously
•  A/C compressor magnetic clutch does not disengage.
(See NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY [MZI-3.7].)
25
A/C does not cut off under wide open throttle conditions
•  A/C compressor magnetic clutch does not disengage under WOT.
(See NO.25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS [MZI-3.7].)
26
Exhaust sulphur smell
•  Rotten egg smell (sulphur) from exhaust.
(See NO.26 EXHAUST SULPHUR SMELL [MZI-3.7].)
27
Fuel refill concerns
•  Fuel tank is not filled smoothly.
(See NO.27 FUEL REFILL CONCERNS [MZI-3.7].)
28
Fuel filling shut off concerns
•  Fuel does not shut off properly.
(See NO.28 FUEL FILLING SHUT OFF CONCERNS [MZI-3.7].)
29
Spark plug condition
•  Incorrect spark plug condition.
(See NO.29 SPARK PLUG CONDITION [MZI-3.7].)
30
ATX concerns
Upshift/downshift engagement
•  ATX concerns not related to engine performance.
(See SYMPTOM TROUBLESHOOTING ITEM TABLE [AW6A-EL, AW6AX-EL].)