engine overheat MAZDA PROTEGE 1992 Workshop Manual

22 KNOCKING
DESCRIP- *Abnormal combustion accompanied by audible “pinging” noise
I-ION
[TROUBLESHOOTING HINTS]
3 Incorrect ignition timing (Too advanced)
@ Air/Fuel mixture too lean
3 Carbon deposits in cylinder
*Fuel injection amount not correct
3 Overheating
l Fuel line pressure decreases while accelerating
TEP INSPECTION
ACTION
1 Connect System Selector to diagnosis connector
Yes Go to next step
and set Test Switch to “SELF TEST” and check
for correct ignition timing at idle after warm-up
CT page F-79
Ignition timing (BTDC)
l BP DOHC : go-1 1 o l BP SOHC : 4”-6O
’ B6 No
Adjust a page F-79
2 Check if “00” is displayed on Self-Diagnosis
Yes Go to next step
Checker with ignition switch ON
W page F-62
No
Service Code No. displayed
Check for cause (Refer to specified
check sequence) w page F-63
“88” flashes
Check ECU terminal 1F voltage CT page F-150
Specification: Battery voltage
(Ignition switch ON)
c3 If OK, replace ECU w page F-149
W: SELF TEST c3 If not OK, check wiring between
ECU and Self-Diagnosis Checker
3 Check for correct intake manifold vacuum at idle
Yes Go to next step
VaCUUm: More than 450 mmHg (17.7 inHg) No
Check for air leakage of intake air sys-
tem components
4
Check for correct engine compression
Yes Go to next step
w page Bl-10
B2-10
Engine compression (Minimum):
l BP DOHC
883 kPa (9.0 kg/cm’, 128 psi)-300 rpm
l BP SOHC
834 kPa (8.5 kg/cm*, 121 psi)300 rpm
l B6
932 kPa (9.5 kg/cm’, 135 psi)300 rpm No High compression
Check engine condition CI page 81-10
62-l 0 l Carbon deposits
F-71

CHARGING SYSTEM G
RUB
PRO
03UOGX-01
Terminal and cable
1. Check the tightness of the terminals to ensure good electri-
cal connections.
2. Check for corroded or frayed battery cables.
3. Check the rubber protector on the positive terminal for prop-
er coverage.
4. Clean the terminals if necessary, and coat them with grease.
Recharging
Battery
55D23L Slow charge Quick charge
(A) (4
Under 6 Max. 20
Slow charging
It is not necessary to remove the vent caps to perform a slow
charge.
Quick charging
Remove the battery from the vehicle and remove the vent caps
to perform a quick charge.
Warning
l Before performing maintenance or recharging the
battery, turn off all accessories and stop the engine.
l The negative cable must be removed first and in-
stalled last.
l Set the battery in water when quick charging to pre-
vent overheating the battery.
G-9