2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0170
P0171
P0172
P2177
P2178
P2187
P2188
1. Fuel Adjustment Value Higher
Than Maximum Limit
2. Fuel Adjustment Value Lower
Than Minimum Limit
3. Fuel Adjustment Value Higher
Than Maximum Limit (Low-Load
Zone)
4. Fuel Adjustment Value Lower
Than Minimum Limit (Low-Load
Zone)
1. Engine slows down and enters
(DFCO) working condition.
2. ECM detected oxygen sensor signal
voltage is higher than 0.55 V.
3. Engine enters power-enriched (PE)
working condition.
4. ECM detected oxygen sensor signal
voltage is lower than 0.35 V.
5. Duration is longer than 12 s.
1. Fuel Injectors
2. Canister
3. MAP
4. TPS
5. HO
2
S (Pre-Catalytic)
3. Schematic:
4. Diagnostic Steps:
Note
Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.
Step 1
Check there are no other control system DTC codes.
(a)
Connect scan tool to the datalink connector.
(b)
Turn the ignition switch to "ON" position.
(c)
Press the scan tool power button.
(d)
Select the following menu items: Engine/Read DTC codes.
(e)
Read DTC codes.
Are there DTC codes other than P0170, P0171, P0172, P2177,
P2178, P2187, P2188?
Yes
No
Step 2
Read the intake manifold absolute pressure sensor data.
(a)
Turn ignition switch to "OFF" position, connect scan tool.
(b)
Start the vehicle.
(c)
Read the intake manifold absolute pressure sensor data.
(d)
Read the scan tool for atmospheric pressure value, and
compare it with table
.
Is scan tool atmospheric pressure reading normal?
No
2-690
Control System JL4G15-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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