Is the heater in your Hongyan New Energy tractor failing? A step-by-step guide to analyzing PTC messages.

Author:F-Diesel Date:September 10, 2025 1:43 AM Tag:[ electric , low-voltage , OBD port data analysis , PTC heater analysis , PTC does not work ]

This knowledge base introduces or describes the This article explains the troubleshooting of PTC heater faults in electric vehicles, including fault symptoms, analysis, diagnostic steps, and message data analysis, helping ensure accurate fault location and efficient repair.

1、Case PTC does not work Fault phenomenon

1.1.The vehicle has no heater Fault analysis

2、fault Troubleshooting

3、Troubleshooting results

3.1.below Data analysis

1. Case PTC does not work Fault phenomenon:

1.1 The vehicle has no heater Fault analysis:

①PTC low-voltage power supply is abnormal

②PTC high-voltage power supply is abnormal

③The air-conditioning panel does not send the PTC enable signal

④PTC does not receive the enable signal sent by the air-conditioning panel

⑤PTC internal

2. fault Troubleshooting:

①Check whether the low-voltage power supply and grounding of the PTC are normal

②Record the data of the co-pilot OBD ports 5 and 13, switch the PTC button once during the recording process, and analyze the cause of the fault based on the data.

3. Troubleshooting results:

PTC internal fault, abnormal temperature of the water inlet temperature sensor Knowledge PTC message analysis There are only two PTC messages, and the IDs are shown in the table.

3.1 below Data analysis:

Convert the data with ID 18FF7572DE to binary. It is less than 8 bits, so fill in 0 in the front to make it 8 bits. Then we get,

BD (hexadecimal) = 10111101 (binary)

00 (hexadecimal) = 00000000 (binary)

85 (hexadecimal) = 10000101 (binary)

38 (hexadecimal) = 00111000 (binary)

00 (hexadecimal) = 00000000 (binary)

10 (hexadecimal) = 00010000 (binary)

BE (hexadecimal) = 10111110 (binary)

A9 (hexadecimal) = 10101001 (binary)

Let's look at the 5th and 7th bytes,