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CM870 and ISX Engines – 018-001   Specifications

General Information

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 WARNING 

This diagram is provided as a diagnostic tool for trained, experienced technicians only. Improper troubleshooting or repair can result in severe personal injury or death or property damage. See important instructions in the Troubleshooting and Repair Manual.

Electrical Specifications

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SAE J1587/J1708 Data Link
Positive wire to chassis ground
(3.5 to 5.0 VDC)
Negative wire to chassis ground
(0.0 to 2.5 VDC)
SAE J1939 Backbone Resistance
Positive wire to return wire – 50 to 70 ohms
Termination Resistance – 110 to 130 ohms
All Continuity Checks
OK (no open circuit) if < 10 ohms
All Shorts To Ground
OK (no short circuit) if > 100k ohms
Short Circuit To External Voltage
OK if < 1.5 VDC
Sensor Supply Voltage
@ ECM – 4.75 to 5.25 VDC
Solenoids
Fuel shutoff valve
Resistance = 5.0 to 8.5 ohms
Turbocharger control valve
Resistance = 5.0 to 9.0 ohms
Turbocharger control shutoff valve
Resistance = 4.0 to 8.0 ohms
Accelerator (NISS, ISS)
Idle validation circuit resistance:
For ON and OFF Idle States
NISS – MAX Closed Circuit Resistance < 10 ohms
ISS – MAX Closed Circuit Resistance < 125 ohms
NISS, ISS – MIN Open Circuit Resistance > 100k ohms
Accelerator Position Coil Resistance
Between Supply and Return Pins
2000 to 3000 ohms
Between Supply and Signal Pins (Pedal Released)
1500 to 3000 ohms
Between Supply and Signal Pins (Pedal Depressed)
200 to 1500 ohms

Sensor Specifications

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Ambient Air/Barometric Pressure Sensor (Harness Mounted)
Altitude (m) Altitude [ft] Pressure [psia] Pressure
[in Hg]		 Voltage (VDC)
0 (sea level) 0 14.7 29.9 3.65 to 4.28
915 3000 13.2 26.9 3.06 to 3.60
1830 6000 11.8 24.0 2.52 to 2.96
2744 9000 10.5 21.4 2.01 to 2.36
3659 12000 9.35 19.0 1.57 to 1.84

Ambient Air Pressure Sensor (Threaded Style)
Altitude (m) Altitude [ft] Pressure [psia] Pressure
[in Hg]		 Voltage (VDC)
0 (sea level) 0 14.7 29.9 3.65 to 4.28
915 3000 13.2 26.9 3.06 to 3.60
1830 6000 11.8 24.0 2.52 to 2.96
2744 9000 10.5 21.4 2.01 to 2.36
3659 12000 9.35 19.0 1.57 to 1.84

Intake Manifold Pressure Sensor
Torque = 23 N•m [204 in-lb]
Pressure (mm Hg) Pressure [in Hg] Pressure [psig] Voltage (VDC)
0 0 0 0.90 to 1.06
377 15 7 1.30 to 1.53
620 25 12 1.57 to 1.84
1551 61 30 2.53 to 2.96
2068 81 40 3.07 to 3.60
2585 102 50 3.61 to 4.23
Turbocharger Compressor Inlet Air Temperature and Intake Manifold Air Temperature Sensors
Torque = 23 N•m [204 in-lb]
Temperature (°C) Temperature [°F] Resistance (ohms)
-10 14 49k to 62k
0 32 29k to 36k
20 68 11k to 14k
40 104 4.9k to 5.8k
70 158 1.6k to 1.9k
Exhaust Gas Pressure Sensor
Torque = 23 N•m [204 in-lb]
Pressure (mm Hg) Pressure [in Hg] Pressure [psig] Voltage (VDC)
0 0 0 0.81 to 0.99
377 15 7 1.12 to 1.37
620 25 12 1.34 to 1.64
1551 61 30 2.11 to 2.58
2068 81 40 2.54 to 3.11
3878 153 75 4.08 to 4.98
EGR Temperature Sensor
Torque = 57 N•m [42 ft-lb]
Temperature (°C) Temperature [°F] Resistance (ohms)
0 32 256k to 423k
20 68 99k to 154k
40 104 42k to 63k
100 212 5.5k to 7.1k
140 284 1.9k to 2.3k
200 392 520 to 580

Rail Fuel Pressure Sensor
Torque = 23 N•m [204 in-lb]
Pressure
(kPa)		 Pressure
[psig]		 Voltage
(VDC)
0 0 0.61 to 0.73
345 50 1.13 to 1.35
690 100 1.65 to 1.98
1034 150 2.17 to 2.60
1380 200 2.69 to 3.23
1724 250 3.24 to 3.85
2070 300 3.74 to 4.48
Fuel, Engine Coolant, and Engine Oil Temperature Sensors
Torque = 23 N•m [204 in-lb]
Temperature (°C) Temperature [°F] Resistance (ohms)
0 32 30k to 37k
25 77 9.3k to 10.7k
50 122 3.2k to 3.8k
80 176 1.1k to 1.3k
95 203 700 to 800
Engine Oil Pressure Sensor
Torque = 23 N•m [204 in-lb]
Pressure
(kPa)		 Pressure
[psig]		 Voltage
(VDC)
0 0 0.75 to 0.90
274 25 1.68 to 2.01
446 50 2.59 to 3.10
515 60 2.96 to 3.54
653 80 3.69 to 4.42
Turbocharger Speed Sensor
Torque = 8.5 N•m [75 in-lb]
Resistance = 600 to 1600 ohms
ECM Connector
*Retaining capscrew
Torque = 4 N•m [35 in-lb]

*Released resistance minus depressed resistance
must be 1000 ohms.

Engine Speed and Position Sensor
*Engine speed sensor and camshaft position sensor
Torque = 25 N•m [221 in-lb]

*Released resistance minus depressed resistance
must be 1000 ohms.
Last Modified:  11-Jun-2010
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