1997 Chevy Silverado P1860 Code and P0741

1997 CHEVROLET SILVERADO
90,000 MILES • V8 • 2WD • AUTOMATIC
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TIMSS
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I have a pretty good challenge for you , I have a 4L60E I have installed a year ago . I had received it from what I thought was a competent trans- builder , they sent me a transmission I had to switch to the electronic selector and electronic speedometer , in other words the whole tail shaft . I kept it because it was my only transportation, and I needed it up and running. Upon install I had the SES P1860 Lock converter PWM . I Went and checked the main feed Pink wire for the 12V at the harness plug ,which I assume the Ignition switch provides this ?!? I Ohmed out the wires associated with the TCC converter pwm solonoid , checked OK no short or none broken. They sent me complete Valve body with solonoids and valve body harness ,I installed it and still I have same codes . I hooked up Snap on ALDL and ran vehicle down the road , reset the SES P1860 and the torque converter engaged and disengaged normally. Could it be they sent me the wrong converter , not compatible with the PWM setup ?I hate the thought of removing the trans to replace the converter , is there a kit like the transgo HD2-2 kit that might get rid of the PWM and maybe fix the possible incompatibility? Or something I could jumper so the lock up converter might work ?The truck chugs the gas with out the lock converter working . Any help would be most appreciated, TimSS
Nov 9, 2008 at 7:52 AM
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JNOVACK
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1997 S/T, C/K, M/L (< 8500 GVW) (VCM) 4L60-E TRANSMISSION DIAGNOSTICS MATRIX
VAC=BARO (MAP AT START UP) - MAP

SENSED PARAMETER /
TCC PWM SolenoidElectrical

FAULT CODE/
P1860

MONITOR STRATEGY DESCRIPTION/
0V to 12VThis DTC detects a continuous open or short to ground in the TCC PWM circuit or the TCC
PWM sensor

MALFUNCTION CRITERIA AND THRESHOLD VALUES/
Fail Counter > 43 Counts out of 50 Total Counts

SECONDARY PARAMETERS AND ENABLE CONDITIONS/
System Voltage between 10 and 19 volts
Engine Speed > 450 rpm for 8 sec and not in
fuel cutoff
gear = 1st
10% < TCC Duty Cycle < 90 %

TIME REQUIRED A /
100 ms/count Continuous

ND FREQUENCY MIL ILLUM. TYPE/
DTC Type A
Nov 9, 2008 at 8:26 PM