Tag: Detroit Diesel Engine Repair

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DetroitGHG14 Idle Will Arm but Will not Restart Engine Solution

This instruction show you guide on how to solve/optimize idle will arm but will not restart the engine for Detroit EPA07 GHG14 DDEC VI 10.

 

Preparations:

DDDL 8.18 2023

Nexiq USB Link 2 Adapter

 

Procedures:

Check as follows:

1 Is MCM fault code SPN 1663 /FMI 7 present?

1aYes; troubleshoot this code first.

1b No; Go to step 2.

 

2 Was the CPC recently programmed?

2a Yes; check for proper CPC parameter settings. Refer to section “Optimized Idle” of the A&I Manual (See table below).

2b No; Go to step 3.

 

3 Using DiagnosticLink, verify the operation of the Optimized Idle Safety Loop and the Vehicle Speed Sensor (VSS). Under Instrumentation, go to the Chart tab and select the following on the chart:

 

  • DSL: Parking Brake
  • DSL: Hood Tilt Switch
  • DSL: Neutral Switch
  • ASL: Road Speed

Cycle each switch and monitor their functionality. Monitor the Road Speed; it should read zero when the vehicle is stationary.

Was a fault with either the Optimized Idle Safety Loop or VSS found?

3a Yes; repair as necessary.

3b No; Go to step 4.

 

4 Is the vehicle equipped with an Auxiliary Power Unit (APU) or ParkSmart?

4a Yes; vehicles with an APU or ParkSmart may not use Optimized Idle to control the cab temperatures. If this is the customer’s complaint, refer to the APU or ParkSmart operation instructions.

4b No; Go to step 5.

 

5 Check the Optimized Idle Thermostat settings; Refer to section “Thermostat Operation” of the Optimized Idle User Manual (DDC-SVC-MAN-0019) . Is the Optimized Idle Thermostat properly configured?

5a Yes; install a test CPC. Go to step 6.

5b No; Refer to section “Thermostat Operation” of the Optimized Idle User Manual (DDC-SVC-MAN-0019) . Verify repair.

 

6 Will Optimized Idle work correctly with the test CPC?

6a Yes; replace the CPC.

6b No; Go to step 7.

 

7 Set the Optimized Idle Thermostat mode to cool the cab and put the vehicle on Optimized Idle mode. Using a heat gun, apply heat to the Optimized Idle Thermostat Skin Temperature sensor; refer to OEM literature for sensor location. Did Optimized Idle start the engine to cool the cab?

7a Yes; Refer to section “Optimized Idle” of the A&I Manual (See table below) for proper Optimized Idle parameter configuration

7b No; Go to step 8.

 

8.Monitor the Optimized Idle Thermostat temperature reading while applying heat to the sensor. Is the reading on the Thermostat display accurate?

8a Yes; replace the Optimized Idle Thermostat.

8b No; Go to step 9.

 

9 Disconnect the Optimized Idle Thermostat electrical connector and measure the resistance between pin 3 of the Optimized Idle Thermostat connector, harness side and the sensor ground circuit of the Skin Temperature sensor harness side connector. Is the resistance less than five ohms?

9a Yes; Go to step 10.

9b No; repair the circuit.

 

10 Measure the resistance between pin 1 of the Optimized Idle Thermostat connector, harness side and the sensor signal circuit of the Skin Temperature sensor harness side connector. Is the resistance less than five ohms?

10a Yes; replace the Optimized Idle Thermostat.

10b No; repair the circuit.

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Detroit Diesel GHG17 Engine Common Powertrain Controller

Detroit Diesel GHG17 Engine Common Powertrain Controller (1)

Detroit Diesel GHG 17 engine Common Powertrain Controller (CPC) has three 18-pin connectors and one 21-pin connector. The following sections contain the connector pin-outs for truck. vocational, transit bus and crane applications.

 

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DDDL 8.18 2023

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The CPC is the interface between the MCM and the vehicle/equipment for engine control and manages other vehicle/equipment functions.

Detroit Diesel GHG17 Engine Common Powertrain Controller (1)

The OEM is responsible for mounting this part in an enclosed, protected environment. The mounting bracket is the responsibility of the OEM. There must be maximum physical separation of the VIH from other vehicle/equipment electrical systems. Other electrical system wires should ideally be at least three feet away from the VIH and should not be parallel to the VIH. This will eliminate coupling electromagnetic energy from other systems into the VIH.

Detroit Diesel GHG17 Engine Common Powertrain Controller (2)

Note : The CPC should be mounted with the connectors pointing down.

The CPC communicates over the J1587 and J1939 Data Links to the vehicle.

 

Detroit Diesel GHG17 Engine Common Powertrain Controller (3)

Within the CPC, sets of data for specific applications are stored. These include idle speed, maximum running speed, and speed limitation. Customer programmable parameters are also stored here.

 

The CPC receives data from the operator (accelerator pedal position, switches, various sensors) and other electronic control units (for example, synchronization controllers for more than one genset, air compressor controls).

 

From this data, instructions are computed for controlling the engine and transmitted to the MCM via the proprietary data link.

Detroit Diesel GHG17 Engine Common Powertrain Controller (4) Detroit Diesel GHG17 Engine Common Powertrain Controller (5) Detroit Diesel GHG17 Engine Common Powertrain Controller (6) Detroit Diesel GHG17 Engine Common Powertrain Controller (7) Detroit Diesel GHG17 Engine Common Powertrain Controller (8) Detroit Diesel GHG17 Engine Common Powertrain Controller (9)