2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0602
ECM Internal Monitoring
---
ECM
4. Diagnostic Steps:
Step 1
Check whether there is control system DTC code other than DTC P0602.
(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.
Results:
DTC Codes Shown
To Step
DTC P0602
Yes
DTC Codes Other Than DTC P0602
No
No
Yes
Step 2
Replace ECM.
2.2.7.39 DTC P0627 P0628 P0629
1. DTC Descriptor:
DTC
P0627
Fuel Pump Relay Control Circuit Open
DTC
P0628
Fuel Pump Relay Control Circuit Short to Ground
DTC
P0629
Fuel Pump Relay Control Circuit Short to Power Supply
Fuel pump relay coil power is provided by the main relay under the control of ECM. ECM controls pump relay terminal No.1 to the
internal ground by ECM harness connector EN01 terminal No.61 and so the fuel pump relay pulls in. ECM has an internal driver
circuit that controls relay coil ground. The driver circuit is equipped with a feedback circuit to ECM. ECM monitors the feedback
voltage control circuit to determine whether the there is an open circuit, a circuit short to ground or power supply.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0627
Hardware Circuit Checks
Circuit Open.
1. Relay Circuit
2. Relay
3. ECM
P0628
Circuit Short to Ground.
2-192
Control System JL4G18-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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