Komatsu SDA6D140E-3 - Page 251

140-3 SERIES
12-209
TROUBLESHOOTING
ACTION TAKEN BY CONTROLLER AND CONDITION
OF MACHINE WHEN ERROR CODE IS DISPLAYED
Condition when normal Action by controller Problem that appears on machine
• Sensor resistance value
Between SNE (1) and (2): 85 – 210
Ω
1. Limits output for operation
(when problem occurs independently)
2. Control of the system becomes impossi-
ble (when E-1C occurs at same time)
1. Reduces output (when problem occurs
independently)
2. Engine stops during operation
(when E-1C occurs at same time)
3. Engine cannot be started
(when E-1C occurs at same time)
• Sensor resistance value
Between SG (1) and (2): 1.4 k – 3.5 k
Ω
1. Limits output for operation
(when problem occurs independently)
2. Control of the system becomes impossi-
ble (when E-1C occurs at same time)
1. Output is reduced (when problem
occurs independently)
2. Engine stops during operation
(when E-1b occurs at same time)
3. Engine cannot be started
(when E-1b occurs at same time)
• Resistance in ground connection circuit
Between CN4 (female) and ground:
Max. 1
Ω
• Resistance in ground cut-off circuit
Between CN4 (female) and ground:
Min. 1 M
Ω
1. Carries out operation under normal con-
trol.
1. Output is reduced
1. Stops fuel injection until engine speed
goes down to operating range.
1. Engine speed varies abnormally.
1. Limits fuel injection amount until temper-
ature goes down to operating range.
1. Output is reduced
• Low-pressure switch resistance value
Between POL and ground
Engine stopped: Max. 1
Ω
Engine above 600 rpm: Min. 1 M
Ω
• High-pressure switch resistance value
Between POH and ground
Engine stopped: Max. 1
Ω
Engine above 1,300 rpm: Min. 1 M
Ω
1. Limits output for operation 1. Runs at low idling.
• Signal 2 voltage (between CN4 (11)
and (8))
Throttle below 0.446 V: Max. 1 V
Throttle above 0.446 V: 15 – 30 V
• Signal 3 voltage (between CN4 (12)
and (8))
Throttle below 0.446 V: 15 – 30 V
Throttle above 0.446 V: Max. 1 V
1. Carries out operation under normal con-
trol.
1. Operates normally.
• Sensor power source voltage
Between CN1 (4) and (11): 4.6 – 5.4 V
• Sensor signal voltage
Between CN1 (6) and (11): 0.3 – 4.5 V
1. Actuated with throttle signal 100%
(when problem occurs independently
and simultaneously)
2. Actuated with throttle signal 0% (when
E-24 and E-36 occur at same time)
1. Fixed at high idling
(when problem occurs independently)
2. Fixed at low idling (when E-24 and E-36
occur at same time)
• Sensor power source voltage
Between CN1 (4) and (11): 4.6 – 5.4 V
• Sensor signal voltage
Between CN1 (6) and (11): 0.3 – 4.7 V
1. Actuated with throttle signal 100%
(when problem occurs independently
and simultaneously)
2. Actuated with throttle signal 0% (when
E-24 and E-36 occur at same time)
1. Fixed at high idling
(when problem occurs independently)
2. Fixed at low idling (when E-24 and E-36
occur at same time)
• Sensor resistance value (water temper-
ature: 10 – 100ºC)
Between TWH (1) and (2): 90 k – 3.5 k
Ω
1. Carries out operation under normal
control.
1. Fixes water temperature signal output to
machine at 90ºC