2 codes after changing Imap sensor

[Hennessy]

(09-18-2022 )Agentspd Wrote:  I vote chasing that turbo speed code. How fresh is the engine harness? What were your reasons for replacing the imap? Were there logged failts prior to replacement?

I originally had the 25% derate with the check engine light due to a bad/clogged/oh-so-disgusting IMAP sensor. Instead of cleaning it which Cummins kind of recommends, I bought a new one and just replaced the old one. I wanted to replace the Delta pressure sensor but did not have the $200.00 for that sensor, so I just cleaned it. Started up the truck to scan the codes and those 4 codes showed up. After doing some research, this is what Cummins showed.... File: 189-t06-687 Page 1 of 11
ISX15 CM2350 X101
Fault Code: 687 | SPN: 103 | FMI: 18
Turbocharger 1 Speed - Data Valid But Below Normal Operating
Range - Moderately Severe Level
1 Check for primary fault codes
2 Turbocharger speed sensor is malfunctioning
3 Intake manifold pressure sensor has carbon buildup
4 Intake manifold pressure sensor stuck in-range
5 Turbocharger speed sensor resistance check
6 Turbocharger speed sensor open circuit check
7 Turbocharger speed sensor circuit pin to ground short
8 Turbocharger speed sensor circuit pin to pin short
9 ECM calibration revision history check
10 Turbocharger speed sensor is malfunctioning


I cleared the codes, nothing came back yet, but I'm gonna put my finger on #3...