TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
Page 453 of 1205
REFERENCE INFORMATION TRANSMISSION SYSTEM DTC 85 Undefined Ratio Error DTC 87 High Ratio Error Circuif Descriptions The control module calculates ratio based on the transmission input speed and output speed sensor reading. The control module compares the known transmission ratio to the calculated ratio for the particular gear range selected. DTC 85 Will Set When- * Throttle position is greater than 25%. l Not in park, neutral, or 4th gear. l Engine speed is greater than 300 r-pm. l Vehicle speed is greater than 7 mph (11 kphl. I COMMANDED lFCAlCUlATEDRATlOIS: I GEAR I LESSTHAN I MORE THAN I I 1st I 2.38 I 2.63 I I 2nd I 1.43 I 1.58 I I 3rd I 0.95 I 1.05 I I REV I 1.97 I 2.17 I l All conditions are met for 2 seconds. - DTC 86 Low Ratio Error Circuit Description: The control module calculates ratio based on the TISS and TOSS readings. The control module compares the known transmission ratio to the calculated ratio for the particular gear range selected. DTC 86 Will Set Whenr l Not in park, reverse, or neutral. l Engine speed is greater than 300 x-pm. l Throttle position is greater than 25%. l Vehicle speed is greater than 7 mph (11 kphl. l Transmission gear ratio is less than 1.06 in 1st or 2nd gear, l All conditions are met for 2 seconds. TM 9-2320-387-24-l Circuit Description: The control module calculates ratio based on the TISS and TOSS readings. The control module compares the known transmission ratio to the calculated ratio for the particular gear range selected. DTC 87 Will Set When- * Throttle position is greater than 25%. l Not in park, reverse, or neutral. l Engine speed greater than 300 rpm. l Vehicle speed is greater than 7 mph (11 kphl. l Transmission temperature is greater than 68°F (20°C). l All conditions are met for 2 seconds. 2-401