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Chech engine and ETS lights on?

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Jul 11, 2007, 7:18 PM

Post #1 of 2 (5227 views)
post icon Chech engine and ETS lights on? Sign In

I have a 96 pontiac grand am gt with @ 101,000 miles. I changed the oil a few days ago and the guy told me I need to consider changing the transmission fluid soon ( it was turning more brown than red). Anyways, the next day I was on the interstate going @ 70 when my check engine light and ETS light came on, so I got off the interstae and went to autozone. A 1870 tranmission code came up. Now, my transmission is not slipping, it didn't jerk or anything when it kicked out of overdrive. It still drives and changes gears perfectly. My questions are how concerned should I be? What is the first thing to try? And how do I reset the check engine light?

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Jul 18, 2007, 7:03 PM

Post #2 of 2 (5212 views)
Re: Chech engine and ETS lights on? Sign In

P1870, TRANSAXLE COMPONENT SLIPPING Circuit Description PCM monitors Torque Converter Clutch (TCC) slip speed by calculating difference between engine speed and transaxle output speed. In D3 drive range with TCC engaged, engine speed should closely match transaxle output speed.
DTC P1810 detects excessive TCC slip when TCC is engaged. Conditions For Setting DTC P1870 DTC will set under the following conditions:
 DTCs P0122 and P0123 (throttle position), or P0502 (vehicle speed sensor) are not present.
 Engine speed is 2000-3300 RPM.
 MAP is 2.9-8.9 psi (20.3-61.5 kPa).
 Throttle position angle is 13-35 percent.
 TCC is on for 5 seconds or more.
 TCC slip speed is 150-1000 RPM for 10 seconds.
 Speed ratio is .98-1.34.
 Vehicle speed is 40-65 MPH.
 All conditions are met for 3 TCC cycles.
DTC P1870 will be stored in PCM history.
MIL will light at first failure signal and PCM will inhibit TCC engagement.
Diagnostic Procedures
1. Ensure fluid level is correct. Inspect manual linkage for misadjustment or binding. Inspect throttle valve cable for misadjustment, binding or broken cable. Repair components as necessary, then go to step 9).
2. Check for low line pressure. See LINE PRESSURE TEST in 3T40 OVERHAUL article. If line pressure is within specification, go to step 6). If line pressure is not within specification, go to next step.
3. Check for restricted oil filter or missing or damaged filter seal. Check for missing pressure relief valve check ball. Check for damaged pressure relief valve or pressure regulator valve springs. Check pressure regulator valve for nicks or scored surface. Check for sticking pressure regulator valve. Check oil pump seals for wear or damage. Check for stuck oil pump slide, vane or drive pump damage. Repair components as necessary, then go to step 9). If components are okay, go to next step.
4. Connect scan tool to DLC. Turn ignition switch to ON position. DO NOT start engine. Using scan tool, record freeze frame and failure records for reference. Data will be lost when DTCs are cleared later in this test.
5. Drive vehicle in D3 with TCC engaged. Record TCC slip speed when transaxle is in 3rd gear with TCC NOTE: Perform OBD system check prior to performing diagnostic procedures.

If this is not in you capability take it to a transmission shop
and tell them to check it at lest you have an idea whats wrong so you will not be taken for a ride .
staff tech

Indy Shop owner

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