1996 Other Oldsmobile Models 1870 code for transmission comp

Tiny
JOHN ANDRUS
  • MEMBER
  • 1996 OLDSMOBILE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 86,000 MILES
I have a 1996 Olds Achieva that the check engine light is on abd when I read the code with my code reader it showed 1870. When I looked up this code it said that it was transmission comp slipping but the transmission seems fine and the car drives great. I can not get it inspected in New York State because of this code showing up. I have cleared the code but it comes back soon after clearing it. What might be the problem that is causing this and is it an expensive repair.

Thanks,
John
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Saturday, August 23rd, 2008 AT 1:10 PM

7 Replies

Tiny
MERLIN2021
  • EXPERT
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 NOTE: Perform OBD system check prior to performing diagnostic procedures. For wire terminal locations, see WIRING DIAGRAMS. For fluid circuit identification, see OIL CIRCUIT DIAGRAMS in section No. 1. Page 1 of 2 DIAGNOSIS - 3T40 -1996 Oldsmobile Achieva SC 8/24/2008
Checking wires and component.
COMPONENT & WIRING HARNESS RESISTANCE & VOLTAGE CHECK 1. Disconnect transaxle wiring harness connector. Turn ignition switch to ON position. Using a DVOM, measure voltage between ground and Pink wire terminal at engine side of transaxle wiring harness connector. Voltage should be 12 volts. If voltage is as specified, go to next step. If voltage is not as specified, repair fuse or wiring as necessary. 2. Turn ignition off. Using an ohmmeter, measure resistance at transaxle side of wiring harness connector between TCC solenoid terminal "A" (Pink wire) and 3rd gear pressure switch terminal "D" (Tan/Black wire). Resistance should be 19-31 ohms. 3. If resistance is as specified, go to next step. If resistance is not as specified, disconnect wiring harness at component and measure component resistance. Replace component if resistance is not as specified. If resistance is as specified, repair wiring harness between component and transaxle wiring harness connector. 4. Measure resistance between component terminals and ground. If resistance is low, replace component. If resistance is high, inspect wiring harness for short to ground. Repair as necessary. Page 1 of 1 DIAGNOSIS - 3T40 -1996 Oldsmobile Achieva SC 8/24/2008
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Sunday, August 24th, 2008 AT 6:32 AM
Tiny
JOHN ANDRUS
  • MEMBER
The etc light is on also even when the switch is turned on. Could this be part of the problem or is it something else?
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Sunday, August 24th, 2008 AT 4:59 PM
Tiny
MERLIN2021
  • EXPERT
Please list ALL cods and problems. ETC light on?
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Monday, August 25th, 2008 AT 5:36 PM
Tiny
JOHN ANDRUS
  • MEMBER
The only code is the 1870 code. The ETC light says ETC off. There is an on and off switch on the dash for the ETC (electronic traction control?). The light stays on whether the switch is turned on or off. Could this be as simple as a fuse that is causing both of these issues and are they possibly related. If there is a fuse where would I find it? Thanks so much for your help!
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Monday, August 25th, 2008 AT 8:08 PM
Tiny
MERLIN2021
  • EXPERT
Break out the owners manual and check for any fuse that has TCC or transmission control. Did you test that pink wire for 12 volts?
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Wednesday, August 27th, 2008 AT 3:24 PM
Tiny
JOHN ANDRUS
  • MEMBER
I found out what was causing this code to pop up. It had nothing to do with the transmission itself. It was a bad neutral safety switch. Thanks for the help.
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Saturday, September 13th, 2008 AT 9:36 AM
Tiny
MERLIN2021
  • EXPERT
Ok your welcome.
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Saturday, September 13th, 2008 AT 10:27 AM

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