Question about Cars & Trucks
I have a hyster h50xm serial number h177b that has a 3.0 gm that wont start. we jumped a to d on the 4 pin weather pack plug and go a flash code of 166 but my book doesnt have the fault code for the ecm of 166 they all should be just a two digit number and not a thre digit please help
Unplug the computer. I did it on mine and it started right up. You just wont have a rev governor and engine monitoring but it will run.
Posted on Mar 19, 2015
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: obd1 scan tool will notaccess
A couple of ways to check and see if the computer is ok first:
check engine light must come onwith they in on position
The fuel pump must run for two (2) seconds with the key ON
There must be a 5 volt reference at sensors like map, TPS
Must communicate with scan tool
The ORANGE wires at the computer are you power input wires one has 12V all the time this is your KEEP ALIVE MEMORY
one is 12 with the Key on you MUAT HAVE VOLTAGE AT BOTH
Check the computers Ground most are out under the hood and are brown wires
Try the GM TAP TEST this is a factory authorized test with the computer connected and you verified all of the above SLAP the computer with the open hand firmly not too hard but firm see if anything changes,
Do not disconnect the battery you will erase all the codes!
Please contact me if you need any additional information.
If you find the information provided helpful please give me a good rating
Posted on Aug 14, 2008
Diagnostic trouble code P1870 (Transmission Component Slippage) is a
General Motors-specific code whose set parameters are determined by
transmission type and engine size. The PCM monitors and compares engine
speed to vehicle speed after the converter clutch has been commanded ON
in either high gear or Overdrive. Should the expected rpm ratio exceed
predetermined parameters, DTC 1870 sets. And upon doing so, the PCM
elevates the transmission main line pressure and stops converter clutch
Once the vehicle has made it to a cruise state, the PCM then begins to monitor the vehicle's cruise ratio. If at some point the transmission begins to slip, P1870 sets and line pressure is elevated in an attempt to stop any further slippage and prevent further damage. This would explain why DTC 1870 Ls often accompanied by a complaint of a hard 1-2 up shift.
When this code sets, it could have any number of causes, ranging from the sump running low of fluid to a malfunctioning torque converter. Take a GM 4L60-E transmission, for example. When it's in Overdrive, the forward clutch and the 3-4 clutches are applied, as well as the 2-4 band. Now add the converter clutch. This is what the PCM monitors at cruise. If the ratio breaks away, the cause could be any of three components, the hydraulics that operate them or the electronics that control them. Fortunately, experience has shown that in most cases, the cause can be traced to some form of converter clutch failure as a result of valve body concerns. With GMs 4L80-E transmission, this code has usually been the result of a cracked converter clutch piston.
Put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.049" - 0.500" boost valve (easy fix in pan), and replace the servo with an upgrade servo from a Corvette 4L60E. This will give you a more firm shift and address the DTC 1870 which is common to a weaken Boost valve or faulty EPC valve.
Posted on Jan 07, 2010
try to get a wiring diagram it sounds like you have a rubbed thru or corroded wire in the circuit. haynes manual at autozone $20.00. Some local larger libraries have the wiring books also.
Posted on Nov 16, 2010
Tips for a great answer:
Jul 30, 2015 | Cars & Trucks
Jul 17, 2014 | 2004 Chrysler PT Cruiser
Jul 29, 2012 | 2003 Chevrolet Blazer
Apr 16, 2011 | 2002 Mercury Cougar
Feb 17, 2011 | 2002 Isuzu Trooper
Jan 24, 2011 | Pontiac Bonneville Cars & Trucks
Sep 08, 2010 | 2000 Chevrolet Impala
Oct 02, 2009 | 1994 Honda Accord
Jun 09, 2009 | 1996 Saab 900
Dec 27, 2008 | 1998 Plymouth Neon
247 people viewed this question
Usually answered in minutes!