11. EFI SYSTEM OF SQR 472ENGINE
11-38
Chapter 4 Troubleshooting diagnostic process
1. Fault diagnosis based on the fault code description
1. Has been recognized as a steady-state current failure to the following maintenance, otherwise it
will lead to wrong diagnosis.
2. The below mentioned "multimeter occasion" refers to the digital multimeter, prohibit the use of
pointer multimeter to check on line electronic fuel injection system.
3.
Maintenance of the vehicle anti-theft system, if the replacement ECU occasions appeared in the
"Next step" bar, pay attention to after the replacement of programming on ECU.
4. If fault code for a circuit voltage is too low, refers to the circuit may be shorted to ground; if the
fault code for a circuit voltage is too high, refers to the circuit has the potential to supply short
circuit; if the fault code for a circuit fault, refers to the circuit breaker may exist in or there are a
variety of line fault.
Diagnostic aid:
1. The fault code cannot clear, failure is a fault; if the breakdown of key check whether there is
loose in the wire harness connector.
2. According to the steps examination, no abnormal situation;
3. The maintenance process don't ignore automobile maintenance, cylinder pressure, mechanical
ignition timing and the influence on the system;
4. Replacing ECU, test. If fault code can remove the fault location, fault code in the ECU, if still
unable to clear, is for the original ECU, repeat the process again, repair work.
2
、
Fault code diagnosis flow
2.1. The upstream oxygen sensor heater control circuit shorted to ground (fault code P0031)
Serial
numb
er
Operation Vehicl
e
speed
detecti
on
Next step
1
Connect the diagnostic instrument, ignition switch is
in the "ON"
Next
step
yes Next
step
2
Dial the joint oxygen sensor wire harness, check with
a multimeter, the joint 1# (connected with the oxygen
sensor white relative), 2# (with the oxygen sensor
cable relative to white) is 12V about the value of
voltage at pin.
no
To step 4
yes Next
step
3
Using a multimeter to check the oxygen sensor 1#
(white), 2# (Baise) resistance between Pin value at
20
℃
in 5.4~6.6 ohm
no Replace
the
sensor
yes Replace
the
fuse
4
15A fuse check the main relay power lines of the
fuse
no Next
step
yes
Repair or replace the wire
harness
5
X1_8# main relay X1_21# pin check ECU
respectively (1# and oxygen sensor connector for
connecting line is legendary white), 2# (with the
oxygen sensor white connection line between pins
relative) whether the circuit breaker or short circuit
to ground
no Diagnostic
aid
Summary of Contents for 1100 GKE OutLaw
Page 1: ...Service Manual 1100GKE 4 4...
Page 62: ...4 COOLING SYSTEM 4 6 Cooling System Chart...
Page 158: ...10 CVT TRANSMISSION SYSTEM 10 7 5 Appearance installation dimension map Fan shaped array 10...
Page 165: ...11 EFI SYSTEM OF SQR 472ENGINE 11 3 3 The ECU control principle diagram...
Page 166: ...11 EFI SYSTEM OF SQR 472ENGINE 11 4 4 The ECU function module layout...
Page 260: ......
