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My Caterpillar 299d2 skidsteer has a message on the screen…

My Caterpillar 299d2 skidsteer has...
My Caterpillar 299d2 skidsteer has a message on the screen when I start this in the morning starting aid low voltage
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Answered in 1 hour by:
12/14/2020
Mechanic: catmastertech, Technician replied 1 year ago
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,043
Experience: Field service technician for CAT 19 years.
Verified

Here are the details for that code.

---

523544-4 Ground short of air heater relay driving circuit Battery voltage is normal, when there is no air heater relay actuation command.
Open circuit of harness to ground for 1 second or more.

Warning Level 2

Symptoms are faulting starting and increased white smoke.

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Mechanic: catmastertech, Technician replied 1 year ago

Here is the troubleshooting steps for this code.

Troubleshooting Test Steps Values Results

1. Run the Engine Until the Coolant Temperature is 10 C (50 F) or Higher.

A. Check the “Start Aid Relay” in Cat® Electrician Technician (ET).

B. The status of the start relay system should state OFF.

Start Aid Relay

Results: If NOT OK, then check the wire harness and connector for continuity.

Results: If OK, proceed to Test Step 2.

2. Check the Air Inlet Heater Relay.

A. Disconnect the coolant temperature connector.

B. Connect a dummy resistor (15 to 25 kilo ohms).

C. This is comparable to coolant temperature of −30° C (−22° F) to −20° C (−4° F).

D. Check Cat ET and the Start Aid Relay should be ON
Air Inlet Heater Relay

Results: If NOT OK, then check the wire harness and connector for continuity.

Results: If OK, proceed to Test Step 3.

3. Measure the Voltage Across the Signal and Ground of the Air Inlet Relay.

Voltage

Results: ·When relay is ON, the voltage should be equivalent to battery voltage.

Results: ·When relay is OFF, the voltage should be approximately 0 V.

4. Check the Continuity Between +B and to Main Air Heater Relay.

Continuity

Results: When the relay is on, there should be continuity.

Results: When the relay is off, there should not be continuity.

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Mechanic: catmastertech, Technician replied 1 year ago

Please post the complete machine serial number (PIN) if you need more help with this.

Thanks,

Don

catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4,043
Experience: Field service technician for CAT 19 years.
Verified
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