Operation Section
-75-
Table 2. MI-07 Diagnostic Fault Codes (Flash Codes) cont’d.
DFC
PROBABLE FAULT
FAULT ACTION *
CORRECTIVE ACTION
FIRST CHECK
742
GasPostO2NotActive
Post-catalyst O2 sensor
inactive on LPG, open O2
sensor signal or heater
leads, defective O2 sensor.
(1) TurnOnMil
(2) DisableGas
Post O2Ctrl
Check that Post-catalyst O2 sensor
connections are OK.
O2 (signal) Pin 3 to SECM Pin B19
O2 Pin 2 (HEATER GND) to SECM
(DRVG GNG) Pins A16, B17
O2 Pin 1 (HEATER PWR) to Post O2
Heater Relay. Relay pin 87. This relay
turns on only after engine has been
running for some time and SECM has
calculated that water condensation in
exhaust has been removed by exhaust
heat. Post O2 Heater Relay has SECM
(DRVP + 12V) applied to the relay coil
power. The relay coil ground is
controlled by SECM Pin A20 to activate
the relay to flow current through the
post O2 heater.
Verify O2 sensor heater circuit is
operating by measuring heater
resistance (2.1
Ω
± 0.4
Ω
)
O2 Pin 2 (HEATER GND) to Pin 1
(HEATER PWR)
743
Reserved
751
GasO2FailedLean
Pre-catalyst O2 sensor
indicates extended lean
operation on LPG
(1) TurnOnMil
(2) DisableGas O2Ctrl
Check for vacuum leaks.
Check fuel trim valves, e.g. leaking
valve or hose.
Check for missing orifice(s).
752
GasPostO2FailedLean
Pre-catalyst O2 sensor
indicates extended lean
operation on LPG
(1) TurnOnMil
(2) DisableGas
Post O2Ctrl
Correct other faults that may contribute
to 752 (e.g. faults pertaining to fuel trim
valves, Pre-Cat O2, Post Cat O2
sensor)
Check for vacuum leaks
Check for leaks in exhaust, catalytic
converter, HEGO sensors; repair leaks.
Check all sensor connections (see fault
742 corrective actions).
771
(77)
GasO2FailedRich
Pre-catalyst O2 sensor
indicates extended rich
operation on LPG
(1) TurnOnMil
(2) DisableGas O2Ctrl
Check fuel trim valves, e.g. plugged
valve or hose.
Check for plugged orifice(s).
(*) Fault actions shown are default values specified by the OEM.
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