
-112-
-112-
( ) Fault actions shown are default values specified by the OEM.
( ) Fault actions shown are default values specified by the OEM.
Operation Section
Operation Section
Table 2. Diagnostic Fault Codes (Flash Codes) cont’d.
Table 2. Diagnostic Fault Codes (Flash Codes) cont’d.
DFC
DFC
PROBABLE
PROBABLE FAULT
FAULT
FAULT
FAULT ACTION
ACTION *
*
CORRECTIVE
CORRECTIVE ACTION
ACTION FIRST
FIRST CHECK
CHECK
731
731
(73)
(73)
GasFuelAdaptRangeHi
GasFuelAdaptRangeHi
In LPG mode, system had
In LPG mode, system had
to adapt lean more than
to adapt lean more than
expected
expected
(1) TurnOnMil
(1) TurnOnMil
(2) Disable
(2) Disable
GasO2 Ctrl
GasO2 Ctrl
(3) Disable
(3) Disable
GasPost O2Ctrl
GasPost O2Ctrl
Check dual dither valves, e.g. plugged valve or
Check dual dither valves, e.g. plugged valve or
hose.
hose.
Check for plugged ori
Check for plugged orifice(s).
fice(s).
732
732
GasDesEquivHi
GasDesEquivHi
In LPG mode, system had
In LPG mode, system had
to adapt rich more than
to adapt rich more than
expected
expected
None
N/A
None
N/A
741
741
(74)
(74)
GasO2NotActive
GasO2NotActive
Pre-catalyst O2 sensor
Pre-catalyst O2 sensor
inactive on LPG, open O2
inactive on LPG, open O2
sensor signal or heater
sensor signal or heater
leads, defective O2
leads, defective O2
sensor
sensor
(1) TurnOnMil
(1) TurnOnMil
(2) DisableGas
(2) DisableGas
O2Ctrl
O2Ctrl
(3) Disable
(3) Disable
GasPost O2Ctrl
GasPost O2Ctrl
Check that Pre-catalyst O2
Check that Pre-catalyst O2 sensor connectio
sensor connections
ns
are OK.
are OK.
O2 (signal) Pin 3 to SECM Pin B13
O2 (signal) Pin 3 to SECM Pin B13
O2 Pin 2
O2 Pin 2 (HEATER GND) to SECM (DRVG
(HEATER GND) to SECM (DRVG
GNG) Pins A16, B17
GNG) Pins A16, B17
O2 Pin 1
O2 Pin 1 (HEATER PWR) to SECM (DRVP +
(HEATER PWR) to SECM (DRVP +
12V) Pin A23
12V) Pin A23
Verify O2 sensor heater circuit is operating by
Verify O2 sensor heater circuit is operating by
measuring heater resistance (2.1
measuring heater resistance (2.1
Ω
Ω
± 0.4
± 0.4
Ω
Ω
))
O2 Pin 2
O2 Pin 2 (HEATER GND) to Pin 1 (HEATER
(HEATER GND) to Pin 1 (HEATER
PWR)
PWR)
742
742
GasPostO2NotActive
GasPostO2NotActive
Post-catalyst O2 sensor
Post-catalyst O2 sensor
inactive on LPG, open O2
inactive on LPG, open O2
sensor signal or heater
sensor signal or heater
leads, defective O2
leads, defective O2
sensor.
sensor.
(1) TurnOnMil
(1) TurnOnMil
(2)
(2) DisableG
DisableGasPost
asPost
O2Ctrl
O2Ctrl
Check that Post-catalyst O2 sensor
Check that Post-catalyst O2 sensor
connections are OK.
connections are OK.
O2 (signal) Pin 3 to SECM Pin B19
O2 (signal) Pin 3 to SECM Pin B19
O2 Pin 2
O2 Pin 2 (HEATER GND) to SECM (DRVG
(HEATER GND) to SECM (DRVG
GNG) Pins A16, B17
GNG) Pins A16, B17
O2 Pin 1 (HEATER PWR) to Post O2 Heater
O2 Pin 1 (HEATER PWR) to Post O2 Heater
Relay. Relay pin 87. This relay only turns on
Relay. Relay pin 87. This relay only turns on
after engine has been running for some time
after engine has been running for some time
and SECM has calculated that water
and SECM has calculated that water
condensation in exhaust has been re
condensation in exhaust has been removed by
moved by
exhaust heat. Post O2 Heater Relay has
exhaust heat. Post O2 Heater Relay has
SECM (DRVP + 12V) applied to the relay coil
SECM (DRVP + 12V) applied to the relay coil
power. The relay coil ground is controlled by
power. The relay coil ground is controlled by
SECM Pin A20 to activate the relay to flow
SECM Pin A20 to activate the relay to flow
current through the post O2 hea
current through the post O2 heater.
ter.
Verify O2 sensor heater circuit is operating by
Verify O2 sensor heater circuit is operating by
measuring heater resistance (2.1
measuring heater resistance (2.1
Ω
Ω
± 0.4
± 0.4
Ω
Ω
))
O2 Pin 2
O2 Pin 2 (HEATER GND) to Pin 1 (HEATER
(HEATER GND) to Pin 1 (HEATER
PWR)
PWR)
743
GasCatInactive
743
GasCatInactive
None
N/A
None
N/A
751
751
GasO2FailedLean
GasO2FailedLean
Pre-catalyst O2 sensor
Pre-catalyst O2 sensor
indicates extended lean
indicates extended lean
operation on LPG
operation on LPG
(1) TurnOnMil
(1) TurnOnMil
(2) DisableGas
(2) DisableGas
O2Ctrl
O2Ctrl
(3) Disable
(3) Disable
GasPost O2Ctrl
GasPost O2Ctrl
Check for vacuum leaks.
Check for vacuum leaks.
Check dual dither valves, e.g. leaking valve or
Check dual dither valves, e.g. leaking valve or
hose.
hose.
Check for mi
Check for missing orifice(s).
ssing orifice(s).
752
752
GasPostO2FailedLean
GasPostO2FailedLean
Pre-catalyst O2 sensor
Pre-catalyst O2 sensor
indicates extended lean
indicates extended lean
operation on LPG
operation on LPG
(1) TurnOnMil
(1) TurnOnMil
(2)
(2) DisableG
DisableGasPost
asPost
O2Ctrl
O2Ctrl
Correct other faults that may contribute to 752
Correct other faults that may contribute to 752
(e.g. faults pertaining to dither valves, Pre-Cat
(e.g. faults pertaining to dither valves, Pre-Cat
O2, Post Cat O2 sensor)
O2, Post Cat O2 sensor)
Check for vacuum leaks
Check for vacuum leaks
Check for leaks in exhaust, catalytic converter,
Check for leaks in exhaust, catalytic converter,
HEGO sensors; repair leaks.
HEGO sensors; repair leaks.
Check all sensor connections (see fault 742
Check all sensor connections (see fault 742
corrective actions).
corrective actions).
771
771
(77)
(77)
GasO2FailedRich
GasO2FailedRich
Pre-catalyst O2 sensor
Pre-catalyst O2 sensor
indicates extended rich
indicates extended rich
operation on LPG
operation on LPG
(1) TurnOnMil
(1) TurnOnMil
(2) DisableGas
(2) DisableGas
O2Ctrl
O2Ctrl
(3)
(3) DisableG
DisableGasPost
asPost
O2Ctrl
O2Ctrl
Check dual dither valves, e.g. plugged valve or
Check dual dither valves, e.g. plugged valve or
hose.
hose.
Check for plugged ori
Check for plugged orifice(s).
fice(s).
(*) F
lt
ti
h
d f
lt
l
ifi d b th OEM
(*) F
lt
ti
h
d f
lt
l
ifi d b th OEM
Содержание G20E-5
Страница 2: ......